other soldiers. he put himself in the line of fire to save them. >> all three soldiers were fathers, all three had served tours in kuwait and iraq. these men and their families are in our thoughts. anderson begins now. good evening, tonight searchers get closer to finding the wreckage of flight 370. late and significant new developments ahead. but first, breaking news, the heroes emerging in a high school, where a sophomore will be charged as an adult. the elements this time of the 16-year-old suspect we are not naming, two kitchen knives and five minutes of terror. >> my best friend stepped in front of me and he got stabbed in the back. and then in 30 seconds, i saw three people get stabbed. >> she helped save the life of one of her friends, three of

more than 20 people wounded in all, you will hear shortly more about how she helped to save her friend's life. this as you might imagine is sending shock waves throughout the small pittsburgh community, where chances are everybody knows somebody involved. we have correspondent pam brown with more. >> reporter: chaos and tragedy this morning at franklin regional high school in murrysville, pennsylvania, police say a 16-year-old ran into the classroom on the horrific stabbing spree. >> i can tell you when we got there, there was a hallway pretty much in chaos as you can imagine. a lot of evidence and blood on the floors of the hallway. we had students running about trying to get out of the area. >> i was walking over towards the exit.

and there was blood all over the floor. thought maybe somebody had a nose bleed or something. and someone yelled she got stabbed. >> area hospitals are treating victims for stab wounds to the chest, torso, and back, according to officials. >> i would say half of them are life-threatening. >> it could have been worse if not for those hailed as a heroes like one quick-thinking student. >> students who stayed with their friends and did not leave their friends. cafeteria workers who just automatically began to care for students who were bleeding. >> a security guard who helped to subdue the alleged attacker, the officer known as buzz is doing fine. he is credited with saving lives. parents scrambling to pick up their teen students, all of them understandably shocked. >> and i saw people holding each

other's hands and saw other people getting cut. just blood everywhere. it was very traumatizing. >> the suspect, seen taken to the police station was treated for minor injuries and cuts to his hands. so far there is no indication of the a motive. >> pamela brown joins us from murrysville, pennsylvania. >> anderson, we have learned that the 16-year-old sophomore who is the suspect has been charged as an adult. he faces 21 counts of aggravated assault, counts of bringing a prohibited weapon onto the property. anderson, he appeared before the magistrate today. the magistrate denied bail. interesting to note his parents did no show up. the district attorney spoke and said the alleged attacker went

around and indiscriminately attacking the people. one victim was still in critical condition at the hospital and there is still a question of whether he will make it. we're learning more about the suspect, the 16-year-old, that he was a quiet kid according to those who knew him who did not have a prior arrest record. so there is still a lot of questions tonight about why he could have done this. the fbi is involved. we learned they just confiscated his computer from his home. and this investigation is ongoing to figure out the motive. anderson? >> all right, pamela brown, thank you so much. this is also somewhat familiar, at this time, like all the others we also see the very best come out in this school, as the principal spoke about the rise in terror, putting it aside and rise to the occasion, even though it means in some cases risking their own lives. >> there are a number of heroes

on this day. many of them are students, and i want you to write that. students who stayed with their friends and did not leave their friends. >> gracey evans did far more, staying with her friend who was wounded. she is telling her story tonight. gracey, when did you first realize something was wrong? >> i was walking from a locker with my friend. and this girl says, hey, you got blood on you. to a random kid in the hallway. and in that moment, the kid just ran down the hall with the knives. and my best friend stepped in front of me and he got stabbed in the back. and then in 30 seconds, i saw three people get stabbed. >> so your friend who stepped in front of you, he was trying to protect you? >> yes, he was protecting me.

he collapsed on the floor. and so did the two other boys that got stabbed after he did. >> when your friend went down was that when you first saw the suspect? >> yes, i saw him stab my best friend in the back with a butcher knife. and he was so quiet, you couldn't even tell that he actually maybe had a knife in his hand. >> he was not saying anything? >> he didn't say a word at all. the whole time he didn't say a word. and he just stabbed my best friend in the back. and i could tell you exactly how much blood there was on that knife and how bloody it was when he came out and how much blood my best friend was bleeding. like it was just incredible what was happening. >> did other people know what was going on or was this happening so fast? were people saying anything? yelling? >> it was happening so quick. but as soon as the three boys

got stabbed in 30 seconds, i let out -- i didn't know what to do so i let out a blood-curdling scream. so at that moment i -- there was somebody that pulled the fire alarm. and then my one teacher told us all to get in his room, which there were three -- the three boys that were injured. and then four of us who were not injured. and my best friend laid down on his stomach so that he could take away some of the pain. and then the boy that mainly got stabbed, that is still i think in critical condition and stuff, he got told to sit up. and i knew that was not right. so i went over and i sat him down. and i screamed out the door, i need to put pressure on this

wou wound. and so my friends, they got me paper towels. >> were people speaking during this time? i mean, were people saying anythi anything? >> we were all just so scared in that room. and we didn't know what to do. there were people like -- there was people everywhere screaming out in the hallway. and it was just -- it was too scary. >> and was -- was the young man who is -- who you were applying pressure to, was he conscious? >> yes, i was keeping him conscious as long as i could. he started to cough, and he barfed. and i couldn't take the smell and that is when a bunch of blood came out of his wound and i couldn't take it anymore. and i stood up, and as soon as i stood up the emt came in the room and said you need to move. so i went out of the room for a minute and then i hear my best friend screaming in pain.

so i went back into the storage room and i held his hand. and he wouldn't let go. the whole way to the hospital. he didn't let go. >> you drove in the ambulance with him? >> yes, because he -- even though i helped to pull the stretcher outside of the school he was asking where i was and everything. because he like needed me by his side. >> i mean, it is just incredible. you're a good friend to have been able to do all of that. how were you holding up during all of this? i mean, it is one thing to be helping other people and when you got to the hospital what happened? >> well, i was crying the whole entire time. i was just trying to keep people alive. i was trying to keep the one kid alive that i was applying pressure to. i was telling him to keep talking to me, keep awake, that he needs to stay awake. that the emts are going to be here soon and you're going to be

fine and everything. i did that the same thing to my best friend. can i say one thing? >> yes, gracey. >> brett, if you're listening to this, i love you and i hope you're okay. and i also want to thank the people helping me and i was not alone in this. >> well, gracey, i wish you well, thank you. a lot of people did a lot of great things. follow me on twitter @andersoncooper, and coming up next, why searchers think they're closing in on flight 370. and as always, more information from our aviation professionals. and also what it is like down there in the rough waters. we'll show you how to pull a plane out from what could be mountains under the sea.

it's built to be as fast o as it is strongadvil. and fights pain at the site of inflammation. and made for people like paul, who believe nothing should stop you from achieving your goals. not doubt. not fear. and definitely not back and shoulder pain. advil has the strength and speed to help you move past pain and make today yours. advil. make today yours. my lenses have a sunset mode. and an early morning mode. and a partly sunny mode. and an outside to clear inside mode. new transitions® signature™ adaptive lenses now have chromea7™ technology making them more responsive than ever to changing light. so life can look more vivid and vibrant. why settle for a lens with one mode. experience life well lit. upgrade your lenses to new transitions® signature™.

because you can't beat zero heartburn. woo hoo! [ male announcer ] prilosec otc is the number one doctor recommended frequent heartburn medicine for 8 straight years. one pill each morning. 24 hours. zero heartburn. and his new boss told him two things -- cook what you love, and save your money. joe doesn't know it yet, but he'll work his way up from busser to waiter to chef before opening a restaurant specializing in fish and game from the great northwest. he'll start investing early, he'll find some good people to help guide him, and he'll set money aside from his first day of work to his last, which isn't rocket science. it's just common sense. from td ameritrade.

[ female announcer ] most of the time it's easy to know which option is better. other times, not so much. so it's good to know that mazola corn oil has 4 times more cholesterol blocking plant sterols than olive oil. and a recent study found that it can help lower cholesterol 2 times more. take care of those you love and cook deliciously. mazola makes it better. take care of those you love and cook deliciously. to truck guys, the truck is everything. and when you put them in charge of making an unbeatable truck... ... good things happen. this is the ram 1500. the 2014 motor trend truck of the year and first ever back-to-back champion. guts. glory. ram.

. day 34 since the boeing triple 7 vanished with 239 souls on board, yet only the start of day two, in the underwater search in what experts say is most certainly a black box pinger. the officials are certain they will find not only the black box but the plane, they are becoming more real. we'll explore them tonight. first the very latest from michael holmes at search headquarters in western australia, so what do we know about the latest search efforts under way right now? >> yeah, it is -- we're 12 hours ahead of where you are on the east coast there, anderson, so it is 8:00 a.m. in the morning. we're expecting more than a dozen planes to be out there again, today, searching for any

floating debris, no luck so far as you know. also more than a dozen ships are out there, as well. you mentioned the word optimism. the air chief marshal angus houston, a man not given to hyperbole, and when he said yesterday the two pings in addition to the ones last saturday have given him optimism, it really is telling that he used those words. he is an extra cautious guy. it is really quite something. they're out there again today, of course the focus on the australian ship that is towing that u.s. navy ping locate r, looking for more pings crucially so they can narrow it down even further. >> michael, have they given anymore sense today, this morning about how long they're going to continue to just try to listen for those pings using that towing locater before they

actually start going under water? because we know time is running out, we don't even know if the pings are still echoing, still going. >> yeah, that is right, i mean, this is the dawn of day 34 in this search. and those pingers are meant to last about 30 days. so obviously, time running out very quickly in terms of getting more pings. what i guess they're trying to do, anderson, in the same way you use cell towers to try to narrow down where a cell phone might be by triangulation. that is what they're trying to do here, they have four pings now. if they get more they can try to narrow it down even further. that ping locater, it is not directional, so when they get a ping, they can say oh, there it is. what they're trying to do while they can still get the pings is try to narrow it down so they can send down the underwater submersible, the bluefin, which

then maps the bottom of the ocean floor and really is looking for wreckage. but that really moves at a walking pace and is a tedious situation. you really have to go down and get whatever it is they could see. this could take weeks even if they are in the right spot. anderson. >> yeah, michael holmes, i appreciate the update. and all the pings, and the wreckage cell, the call to what comes next when a debris field is actually located. now, in a moment we'll show you just how truly deep the ocean is and the challenges conducting the recovery operations. first, i want to focus on the latest news about the pings and the scramble to hear more. cnn analyst, david souci, author of why planes crash, and david gallo, director of special projects of the woods institution. also, richard quest, richard,

just big picture, in terms of the optimism that we heard from that last press conference from angus houston, i mean, we've never really heard him come as close as what he did today, saying what he did. >> yeah, and going one stage further was his natural reluctance to take that step until he has hard physical evidence. and that is what he said again and again in his late night press conference. i want to see evidence. not just because that is what he needs but because that is what the families require. so that they have certainty of what happened and they can begin the process of closure on the event. >> dave gallo, when we look at the map where you see the four different spots where they heard pings on two different days and we're looking at it right there it is confusing because you know there are only two black boxes. so why were there all of these different positions? can you just explain -- my

understanding is because of the way sound can refract under water, that is why you're getting these locations. >> when you look at the graphic, i think you can see where the ship was or the pinker was -- pinger was, it doesn't mean that is where the plane was -- >> why is it spread out? because sound bounces around on the water? >> exactly, sound bounces around, and depending on where the tpl is, the sound, it depends on where they go, with the layers and the topography. >> that is why they're getting the opportunity to hear more pings -- >> it would be like standing up on the mountains in the colorado mountains, shouting, you hear the echo go out, sometime it goes over the mountains, you could be standing on the rock on the other side and not hear that

shout. that is kind of what is going on. that is how you get it closer, saying that is an echo, a refracted area -- >> how long do you think they will continue with the pinger locater? because we know -- 30 days is supposedly the life span of this thing. i talked to i think it was captain matthews who said we'll maybe give it as much as 45 days just in case. >> yeah, i think when we were talking to matthews at that time, he referred to mostly saying if we get no pings between now and then, we can go as long as 45 days. but they are getting pings. they will continue in that general area. as long as days go by to get the pings, i think to judge it properly if it were me if we had no pings for three days then let's give it up. because we're not going to get anything at that point. >> and we understand they

dropped sonobuoys, why would they do that? >> sonobuoys from an aircraft, they're very capable devices to hear low amplitude sounds. >> and when you see that map again of the locations, how realistically is that, how tough an area again, just to go for more pings? >> well, i don't think you need to cover that entire area, i think you need to start with an area that is larger than that, maybe -- if you think everything is within the one by one mile area you may want to map -- >> you're talking about under water searches, wouldn't they continue to go back over that entire area? >> that depends on how they're trying to pick up the sounds, trying to triangulate on the sounds. they have whoever is calling the shots on the ship has a plan to re-acquire and trying to triangulate on the sounds. >> there is a website, i know

david gallo, you have been paying attention to. marinetraffic.com. it shows the vessels in the area right now. we can also see the search pattern of the ocean shield. what does that tell you? >> well, the ocean shield has not moved from that spot. it looks like a slightly lighter shade of blue, doing the pattern back and forth, a triangular pattern. the ocean shield is sitting there listening to something. >> richard, it is fascinating that no ocean debris has been found. i mean, they're zeroing in on that situation. >> and that remains the conundrum. they're sending more planes in a tightly formatted area. and that is what he said at the

press conference because they're able to focus down on that. with this whole process, angus houston said there is no second chances when it comes to the pingers. when they're dead, they're dead. and that is why he is throwing everything he has got at the pingers, the location, until he is sure for several days two or three days after he gets any last ping because he wouldn't be able to re-create that once they finish. >> we have to take a quick break, coming up more, the extreme ocean environment more than 10,000 feet. we'll take a closer look at what we know. the bottom of the sea in the area. also the latest on the search from commander william marks on the scene with the u.s. navy fleet. i got this. [thinking] is it that time? the son picks up the check? [thinking] i'm still working. he's retired. i hope he's saving. i hope he saved enough. who matters most to you says the most about you.

at massmutual we're owned by our policyowners, and they matter most to us. whether you're just starting your 401(k) or you are ready for retirement, we'll help you get there. this is mike. his long race day starts with back pain... ...and a choice. take 4 advil in a day which is 2 aleve... ...for all day relief. "start your engines"

. if the search for flight 370 is indeed zeroing in on the right place it is a challenge, to say the least, on that stretch of the indian ocean. now, i want to give you some perspective on just how deep we're talking about. take a look at that, the top is sea level. when people go for scuba diving, they go down maybe 100 feet at the most. the empire state building, over 1200 feet. and the grand canyon, over 5200 feet. the deep sea diving, and the wreck of the titanic found at a depth of 12,500 feet. now, the towed pinger locator, that is about 12,000 feet below the surface.

it is below 13,000 feet. even though the australian officials are looking in the right place there are challenges when they talk about the depths, three miles down in darkness with silt that can be very thick. a difficult environment to be sure. sad that we actually know more about the surface of the moon than the bottom of the ocean. so just how has the sea bed been mapped? gary tuckman has that. >> on the bottom of the sea, it is dark and mysterious. the video you're looking at was taken with an underwater camera during an oil exploration under the sea. but during the discovery, more than 9,000 feet down, a vessel that sunk during world war ii, spotted on the sea floor, the ship now visible for the first time in almost 70 years. the camera picture remarkably clear. but it was not the camera that originally spotted the wreck. it was sonar. >> so you can only see eight, ten, 12 feet at a time.

with the sonar type system you could actually map much larger areas. >> david miller is the president of a company that helps to map the world's oceans and seas. >> despite the fact that 70% of the world is covered by ocean, only 5% of our oceans have been explored to date. >> this is a side constant sonar device, tossed to the water off san diego. to give us a look at what is under our boat. >> all these little rescctangul spots? >> this is shallow water, what can you see in the deep, this amazing amount here, the underwater vehicles glide through the deepest ocean depths in the world with the sonar attached. these are actual images, not animati animation, it is transmitted by

acoustic beams. it is a surreal underwater scene with mountain ranges, some mountain ranges more than 60 feet tall, or 60 stories on a building. >> the oceans are really no different than what we see as humans on land, there are valleys and ranges. >> they use the sonar for under water, like this area, searches are not always successful, particularly when you're dealing with the mountainous plateaus that are in the indian ocean where it is believed that flight 370 now rests. if they're able to ascertain for sure that the wreckage is nearby and the bottom of the indian ocean is flat do you think they will be able to find the plane? >> yes, there is a hard probability they will be able to find the plane in those conditions. >> but that is a big "if," because most of the underwater area being searched has never, ever been explored. gary tuckman, cnn, san diego. and joining us once again is

david gallo, and david souci, david, the silt that is supposedly underneath here will that interrupt the side sonar scanner? >> i don't think silt will be a problem. we always have to worry a bit about sediment kicking up. it would happen certainly not to the level it would impact the sonar search -- >> and the environment, we talked about this a little during the break. the environment at these kind of depths under the water, it is a whole other world. >> it is a completely different world that nobody has a concept of. 50% of the ocean is above that. >> you see species down there you don't see anywhere else. >> all sorts of life forms, you don't see underwater rivers -- >> what is an underwater river.

>> it is density, water moves because it is dense, if it is salty or cold, the water is actually water that cuts across the sea bed. >> of water that is more dense? >> yeah, it floats, it started to use the antarctic and pours into the basins, the lakings are own more amazing that you can go to the bottom of the ocean and see what looks like a lake at night. >> would it interfere with the towed pinger locators? >> potentially it could, it makes a little bit of extra noise, there are some that are in that frequency range. there is the physical movement of the propeller and pieces on it that can interfere. it should be distinguishable, but as the battery gets weaker and weaker -- >> the side sonar scanner, i think it is called bluefin, how deep with it go? >> 4500 meters it can go. that is operating maximum.

and we're right about there. they're right on the very edge of that operating capabilities. if they move to the north, it drops rapidly to about 6,000 meters. if they go a bit to the south it climbs up to 2,000 meters. but i think it is to the north that it could cause a problem. >> what happens if it goes deeper? >> it would float -- >> it is crushed because of the pressure. >> and there are ways around it. they can fly higher above the terrain. >> it is called a side scanning sonar, but does it have a depth of -- i mean, can it scan at a certain depth? does it have to be on the same level or can it scan below. >> if you want to see further, you can come up off the bottom and looking out to the side you will see further, just like in an airplane the higher out the further you can see. you have less of an idea of what you're looking at. if you want an accurate view --

>> are there rovers that can do that? >> yeah, the bluefin-21 can do that. if they're read at that operating depth they probably don't want to chance losing the vehicle. phoenix international is very capable of figuring this out so i am sure they have other things, plan b in the back of their mind. that is the team out there operating the tpl and the bluefin-21. >> and these are private teams that are contracted? >> yeah, it is a company out of largo. >> how deep can an unmanned vehicle go? >> we have vehicles that can go to 6,000 meters, 95% of the sea floor. just on the other side of australia we have a very new vehicle going down into the trenches. that is full ocean depth. >> that is incredible. >> it is technology, it has been great to watch the technology over the last 20 years. >> and a depth like that, is it

just collecting data or does it have arms that it can pick out things? >> yeah, it is a very special vehicle, if you're working at seven miles depth, you have to have ten or 12 miles of cable. now they just dive down there with a simple fiber strand. >> that is incredible. amazing technology. david gallo, thank you, david souci as well. up next, an update from commander marks. and also, blistering cross examination of olympic star oscar pistorius. we'll take you inside the courtroom. it steals your memories. your independence. insures support. a breakthrough. and sooner than you'd like... ...sooner than you think. ...you die from alzheimer's disease. ...we cure alzheimer's disease. every little click, call, or donation adds up to something big.

alzheimer's association. the brains behind saving yours. you're an emailing, texting, master of the digital universe. but do you protect yourself? ♪ apparently not. when you access everything, you give everyone access to everything about you. but that's ok. while you do your thing... [ alert rings ] we'll be here at lifelock, doing our thing. watching out for things your credit card alone can't. [ alert rings ] and relentlessly protecting your identity. get lifelock protection and live life free. [ alert rings ]

or how ornate the halls are. tall the building is, it doesn't matter if there are granite statues, or big mahogany desks. when working with an investment firm, what's really important is whether the people behind the desks actually stand behind what they say. introducing the schwab accountability guarantee. if you're not happy with one of our participating investment advisory services, we'll refund your program fee from the previous quarter. it's no guarantee against loss and other fees and expenses may still apply.

chuck vo: standing by your word, that's what matters the most. with the quicksilver cash back card from capital one, it means unlimited 1.5% cash back on everything you purchase, every day. it doesn't mean, "everything... as long as you buy it at the gas station." it doesn't mean, "everything... until you hit your cash back limit." it means earn 1.5% cash back on every purchase, every place, every occasion, all over creation. that's what everything should mean. so consider... what's in your wallet?

day 34 for flight 370, back with us tonight, commander marks on board the command ship uss blue ridge. commander marks, appreciate you joining us again. can you give us an update on how the search is going at 8:39 p.m. in the region? >> sure, we are much more optimistic than we were even a day or so ago.

and even then, many more times optimistic than a week ago. we were up to four distinct detections on the black box, we turned around on the reciprocal course, and then a four-minute and seven-minute chunk of detection time. so when you put these two together it makes us very optimistic. when you only had the one set, i would call us cautiously optimistic. but now that we had the second set, we are optimistic we are getting closer. a couple of reasons why, one, we worked very closely with the joint acoustic center in australia. and they determined these are very clear, distinct signals. so they're a continuous ping coming out with clear signals. this is not something you would find with commercial shipping. not something you know, just found in nature.

this is definitely something that is man made, very consi consistent with what would come from these black boxes. and the second thing is we did hear two distinct locations. and so that would be both consistent with the cockpit data recorder and then the voice recorder. so we are looking pretty good now. and it is a good find. >> do you have a sense of how much more -- how many more days, i assume it is days, how many more days you might go at trying to pick up more pings? i know it is not your call to make. there is a number of different players here in the region. but do you have a sense of how much longer you're going to go before trying to get the pings? >> that is really the next decision point. so we have our experts here working with the experts from australia and other agencies. so what you have to do is

maximize the use of the tpl. the towed pinger locator is only good once the black boxes are pi pinging, once they stop, there is really no use. so while we have the potential of the black boxes to have battery life, maybe it is only a day or two but we still want to use that. once you get the bluefin in the water, the side scan sonar, there is really no limit for that. you can use that for an indefinite period. i would say there is really no rush to get that in. i know everyone wants to start getting you know, sonar pictures of the bottom, but if we take out the tpl now, we're really going to give up the last couple of days of any potential black box ping. so most likely we'll try to maximize that and get the side scan sonar in later. >> good evening, it is richard

quest. let me reverse that point to you. you will keep using the tpl for as long as you can. but then how many days of no signal? no pings do you think would be appropriate before you can say all right, it is over. it is done, let's get it down there. >> yeah, that is really the question. and me here on seventh fleet, you know it is not my decision. but what is encouraging is the second set of hits on the black boxes were only really 15 or ten kilometers away from the first set. so -- that is still a big search area. so if we can narrow that down i think that is the best course of action. so you know, i can't answer you definitively. you know, maybe a day or two but i still think there is value in listening with the tpl before you get to this very slow, deliberate methodical search

with the bluefin-21. >> interesting, so maybe a day or two. >> yeah, commander marks, just to clarify something, do you think it is possible that the signals that you're receiving may be from both the digital flight data recorder and from the cockpit voice recorder? >> yes, so there are a couple of indications we had. first i should let you know there was a slight variation in frequency, and that can be expected. that is not something completely out of line. but on that first day we did have the same type of signal coming from two locations. the second day we couldn't quite decipher that. but on the second day we did have two distinct locations. so there are indications that indeed, both of those black boxinbo boxes are out there. >> do you recall the approximate

distance between the two? >> no, i don't have that. but it was not that great of a distance. because if we can hear it with the tpl you're only talking a couple of kilometers. so not that huge of a range. >> thank you. >> yeah, commander marks, this is david souci -- how are you? >> doing well here in the pacific. >> okay, great, what i would like to ask you when you saw the two-hour connection and you were getting the pings for two hours, and i'm hearing they were not able to be re-acquired. i am hearing you went to the south. would you not go to the north? it appears because they were so far away from the two hours they may just be the refracted ping hours that you're hearing below. is the plan to go north now? >> you know that is a good point. with this initial two-hour detection, when we did re-acquire for a very short time in that 13-minute block, and

that was as we turned around on that reciprocal course. but we are searching the entire area. it is just a matter of slowly and methodically doing that. you have to realize we are only moving at the pace a person can walk, so a couple of miles an hour. so you have this dimension of depth. so what is a miracle, the first hit we got, only up 300 meters -- so very shallow, once we heard it we lowered the tpl down to 400 meters, then really you want to get it at more like 3,000 meters. so we are searching the whole area, it is just a matter of slowly and methodically doing

it. >> commander marks, it is good to have you on, i think the nhl from that conversation is really the one or two days they will still listen for pings. next, more on oscar pistorius at his murder trial. >> would you take responsibility for that? >> i did, my lady. >> then say it. say yes. i shot and killed reeva steencamp. >> i did, my lady. >> okay. defiance is in our bones. defiance never grows old. citracal maximum. calcium citrate plus d. highly soluble, easily absorbed. [ female announcer ] f provokes lust. ♪ it elicits pride... incites envy... ♪ ...and unleashes wrath.

♪ temptation comes in many heart-pounding forms. but only one letter. "f". the performance marque from lexus.

[ female announcer ] most of the time it's easy to know which option is better. other times, not so much. so it's good to know that mazola corn oil has 4 times more cholesterol blocking plant sterols than olive oil. and a recent study found that it can help lower cholesterol 2 times more. take care of those you love and cook deliciously. mazola makes it better. bob will retire when he's 153, which would be fine if bob were a vampire. but he's not. ♪ he's an architect with two kids and a mortgage. luckily, he found someone who gave him a fresh perspective on his portfolio. and with some planning and effort, hopefully bob can retire at a more appropriate age. it's not rocket science. it's just common sense. from td ameritrade. it's just common sense.

at od, whatever business you're in, that's the business we're in with premium service like one of the best on-time delivery records and a low claims ratio, we do whatever it takes to make your business our business. od. helping the world keep promises.

in crime and punishment, the prosecution pulled out all the stops during a blistering cross examination of oscar pistorius, back on the stand. he was grilled on the night he killed his girlfriend, reeva steencamp. the prosecutor was known for his aggressive style, and it prompted the defense to claim only the court can see pistorius because he has chosen not to be on camera. but only the audio was available. >> reporter: this is the video shown by the prosecution in its first day of cross examining oscar pistorius. the olympian shooting water melons at a gun range, yelling, then saying it is a lot softer than brains. the defense called the court presentation an ambush, evidence they say they were not privy to. the judge allowed it. and the judge ordered a graphic

photo of reeva steencamp on every courtroom screen. >> i'm going to show you mr. pistorius, the bullet that went into her head. >> pushing pistorius to look, to compare the watermelon to reeva steencamp. >> my lady, i was there that night. >> have a look, i know you don't want to because you don't want to take responsibility but it is time that you look at it. take responsibility for what you have done, mr. pistorius. >> and in doing so may have over stepped. >> it is a valid strategy to try and set all the defendants so that they essentially get tripped up on the stand. but there are reasonable limits with which that can be done. >> earlier pistorius was on the stand for the defense. >> i had her head on my left shoulder. and i could feel the blood was running down on me. >> oscar pistorius finally detailing the moments after he shot and killed his model girlfriend, reeva steencamp. >> all the shouting, screaming

for him to -- to get her to the hospital. >> he says he desperately tried to save her life. >> i had my fingers in her mo h mouth-to-moumout mouth, to help her try to breathe. >> the defense making him recap minute by minute. >> while reeva died, i was holding her before the ambulance arrived so i knew there was nothing they could do for her. >> the amputee said he did not have his prosthetics on when he broke the door down. the defense trying to disprove witness testimony, discussing statements from the neighbors on either side of pistorius' home, neighbors the prosecution never called to the stand who say they never heard a woman's voice that night. >> she heard loud crying. and not a woman screaming.

>> pistorius continuing to proclaim his innocence. >> i did not intend to kill reeva or anybody else, for that matter. >> it was a tragic mistake, said pistorius under prosecution, who intended to prove it was premeditated murder. >> you made a mistake. you killed a person, didn't you? >> i made a mistake. >> you killed reeva steencamp, that is what you did. >> now, this hostile aggressive cross examine will continue. the state prosecutor said we will show you, you are lying. robyn curnow, cnn. and a family trying to sail around the world with their kids, plus a play date with prince george, who makes his first public appearance in new zealand. we'll be right back.

anybody have occasional constipation, diarrhea, gas, bloating? one phillips' colon health probiotic cap each day helps defend against these digestive issues with three types of good bacteria. i should probably take this. live the regular life. phillips'.

afghanistan, in 2009. orbiting the moon in 1971. [ male announcer ] once it's earned, usaa auto insurance is often handed down from generation to generation. because it offers a superior level of protection. and because usaa's commitment to serve current and former military members and their families is without equal. begin your legacy. get an auto insurance quote. usaa. we know what it means to serve.

some other stories we are following, susan hendricks has more. >> anderson, the students killed in the shooting rampage were mourned at fort hood. president obama spoke just as he did before. >> as commander-in-chief i'm determined that we will continue to step up our efforts to reach

our troops and veterans who are hurting. deliver to them the care that they need. to make sure we never stigmatize those who have the courage to seek help. also today, a child who died after a car crashes near a daycare center near orlando, a dodge durango pushed into the building, and the police are still looking for the driver. and a 1-year-old girl and her family are finally back on dry land after a scare at sea. the child felt ill during a sailing trip that was supposed to take them around the world. just days into the voyage they had to be rescued. a mission that involved the coast guard, the navy, and air national guard, as well. and take a look at prince george who mixed it up with a group of babies. he is traveling with the duke and duchess of cambridge, mom and dad to him. not really your typical play

date. >> very cute baby, a roomful of cute babies, could watch that all day, susan, thank you very much. that does it for us, be sure to set your dvr, the prime time edition with jake tapper starts now. it was starting to look like the trail was running cold. but now, officials sound more sure than ever that they will locate flight 370. jake tapper, this is "the lead." the lead, this could be it. the search area is shrinking after crews once again intercepted pings that may be from the black boxes. but actually getting to those black boxes, well, that is a tragedy. and 20 people stabbed with kitchen knives, most of them students. the young suspect walked into school like any other teenager but he walked into court later in the day as an adult for what hell