remains of their loved ones could be found if they want them to be brought to the surface. some chose to. others chose to lay them there at the bottom as a final resting place. >> a final resting place. that's what many people do. thank you, richard quest. we appreciate it. >> the prosecution continues. oscar pistorius returns to the stand this hour for what could be another grueling day of testimony. we are live in pretoria. >> we had students running about, trying to get out of the area. a lot of evidence of blood on the floors in the hallway. >> another american school wracked by violence. a 16-year-old allegedly wields knives on his fellow students leaving a community asking "why?" plus take you live to perth, australia for the latest on the

multinational search for flight 370. hello, everyone. you are watching cnn newsroom. i am rosemary church. >> a big welcome to viewers in the u.s. and around the world. thank you for joining us. did oscar pistorius shoot and kill his girlfriend reeva by mistake or is there something more to the story? >> the question is central to the olympic athlete's murder trial set to resume shortly. prosecutors will be cross-examining pistorius for a second straight day in 30 minutes. we will of course bring you that live. >> the prosecution questioned pistorius aggressively on wednesday. they showed a video of the accused shooting watermelons at a gun range followed by a graphic picture of his girlfriend's wounded head.

again, pistorius broke down with emotion. >> you killed her. you shot and killed her. won't you take responsibility for that. say yes. i shot and killed her. mr. pistorius, did you at any time intend to kill reeva? >> i did not intend to kill reeva, my lady or anybody else. i felt helpless. i wanted to take her to the hospital. i had my fingers in her mouth to help to try to breathe. i had my hand on her hip trying to stop the bleeding. >> oscar pistorius, as you have never seen him before. >> screams of delight. listen to the voice of a man who sound very much like oscar

pistorius. [ indiscernible ] >> no, you did. you said it's softer than brains. >> i was referring to a zombie. >> what i can see there is the effect, the ammunition had on a watermelon. it exploded. am i right? >> that's correct. >> you know the same happened to reeva's head. i know you don't want to take responsibility. it's toime you look at it. >> i have taken sponlresponsibi. for my time on the stand to take, i have taken responsibility. i will not look at a picture i am tormented what i saw.

as i picked up, my fingers touched her head. i remember. i don't have to look at a picture. i was there. >> particularly difficult moments there. we will of course have much more on the trial coming up. we'll hear from our legal analyst in pretoria in 20 minutes from now. >> rosemary, we have listened each day this week as oscar pistorius has been emotional on the stand. we will of course bring you today's cross-examination as soon as it gets under way this hour. for viewers in the u.s., early start, new day will have special coverage of the trial throughout the morning. >> a quiet community near pittsburgh, pennsylvania is reeling after a violent day. >> authorities and families trying to figure out why a 10th grader armed with two large knives stabbed 22 people at his high school. pamela brown reports. >> reporter: this teenage boy behind the terrifying rampage today, a five-minute alleged stabbing and chaos at his pennsylvania high school.

>> i was walking towards the exit. there was blood all over the floor. thought maybe some body had a nosebleed. and someone yelled, she got stabbed. >> officials say 16-year-old alex hribal used two large kitchen knives. >> this is a nice young man. not a loner. he works well with others at school. >> reporter: fbi agents were seen at hribal's home following the attack. >> the suspect's computer is being confiscated, it has not been forensically examined yet. i'm told the subject did not have a cell phone. >> reporter: the sophomore arraigned this evening charged as an adult. four counts of criminal attempt to commit homicide. 21 counts offing ara va ing ara. the carnage began sthohortly bee the start of classes.

hribal started stabbing students in a crowded hallway. a fire alarm was pulled during the attack that likely helped get more people out of the school. >> i can tell you what we saw when we got there. a hallway that was, pretty much in chaos. as you can imagine. a lot of evidence of blood on the floors in the hallway. we had students running about. trying to get out of the area. >> investigators say minutes after the attack started an assistant principal tackled the teen. and a school resource officer was able to handcuff the suspect. >> there are a number of heroes, students who stayed with their friend and did not leave their friends. cafeteria workers who automatically just reactively began caring for students who were bleeding. teachers, teachers aides, who pulled students out of the hallways and into rooms and began applying first aid and

protecting the children. and then, obviously -- the school resource officer. >> the suspect, 16-year-old alex hribal charged as an adult. four counts of criminal intent to commit a homicide. in court the magistrate denied bail for hribal. his defense attorney asked for psychiatric e vvaluation. interesting to note his parents were not present during the arraignment. pamela brown, cnn, murraysville, pennsylvania. ♪ ♪ >> we are seeing a tightened focus for search for flight 370. >> finally two underwater pings revealed wednesday have authorities optimistic they may soon find the plane. this map you see on your screen now is the latest of this huge

operation which now covers some 58,000 square kilometers. that is about 22,000 square miles. >> total of four suspected segales hasegal segal -- signals have been picked up in line with the estimated flight path. >> right now ships and aircraft are working the area of course looking for evidence of debris. >> all right, let's get the latest now on the search. our correspondent joins us live from perth, australia, aaron, after 3:00 in the afternoon in perth. we haven't had any update on search operations from air chief marshal angus houston. what do we know about any progress made on this day? >> hi, rosemary, well i spoke to spokesperson from the british ministry of defense just a short while ago. she tells me that the british vessel, the "hms echo" is in fact moving in the direction of the ocean shield in order to be able to support it in its

operation. she said that it is moving because that, at the moment, is the most promising lead. she also noted everyone pretty much has discounted the detections of the chinese vessel made over the weekend. as for what exactly it is going to be doing when it arrives, she said that is unclear. she said at the moment the "ocean shield" is taking the lead in this operation. worth noting of course that the "hms echo" is equipped with sophisticated sound-detecting equipment and technology that would enable it to map the ocean floor. at the moment we do not have any information or any sort of confirmation in terms of of what it will be doing when it arrives from authorities here in perth, it is not clear if this is going to signal some sort of new phase of this operation. the moment, as far as we know, the ocean shield, the australian vessel still combing the waters. equipped with that american toad

pinger locater. trying to detect signals. the more pings it gets. the more narrow a potential search field. making it even easier for an underwater physical search for wreckage to take place. it is worth noting. yesterday, angus houston the man responsible for coordinating the operation said he did not want any other vessels in that area while the sound search was going on any other vessels in the area could potentially interfere with the detection of the signals. rosemary. >> all right. our reporter reporting live from p perth, australia. >> we'll have more on the missing malaysian airliner for you later and also more on the crisis in ukraine. >> we don't take anything for granted. >> we want to -- i think we are going to go to -- pretoria. there we are, oscar pistorius, he just went into the courthouse. this is his second day of

cross-examination. that is significant. yesterday, of course, it was grueling. we saw the prosecutor who has a reputation for being a pit bull. his title. a representation for really laying into his cross-examination. what we saw. we will have more on this as soon as he gets started there. we will go there live and bring tight you. stay with us. i dbefore i dosearch any projects on my home. i love my contractor, and i am so thankful to angie's list for bringing us together. find out why more than two million members count on angie's list. angie's list -- reviews you can trust. he thought it was the endn for his dof the conversation.d... she didn't tell him that her college expenses were going up. or that she maxed out her card during spring break. when the satellite provider checked his credit, he found out his daughter didn't pay her bills.

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>> welcome back, the world bank and imf take up the crisis in ukraine today when they meet in washington, d.c. >> yeah, members hope to approve an $18 billion aid package to kiev. >> ukraine's interior minister, says protests will be resolved by negotiations or by force. >> russian foreign minister and u.s. secretary of state john kerry discussed the situation by

phone. u.s. officials say they agreed it should be resolved peacefully. >> now, while no clashes were reported wednesday, the streets are thick with tension. >> and the protesters are getting better organized and digging in. senior international copy, nick patton walsh takes us behind the barricade in donetsk. >> reporter: you can see here really how these protesters think that discussion is going to go. 48 hours ago, none of the barricade were here. but now they stretched all around this key building. and this system put very quickly in place. the protesters haven't grown much in number. but it is clear they are now firm in their demand which is always been a referendum to bring this, the self-declared people's republic of donesk into

russia. >> yes. it's the people's republic of donesk, one of the big groups that want to give people power and want freedom for us. >> here in the self declared people's republic of donesk, the overnight officials, they don't want us filming inside barricades. citing safety. russia, save us from slavery. and this one saying, doesn't want fascism. all around us, a sense making permanent their presence. this woman carrying out a number of documents from inside the building. in the offices up there, one given out for each of the regions. that may seek to john this self declared republic. as the the dead lean approachli. >> washington accuses moscow of orchestrating the unrest as pretext for possible military intervention. but russia says it has no

intention of invading ukraine. just how worried he is about tens of thousands of russian troupes amassed along the border. are you more concerned today than you were for instance that russia will take the next step and go into eastern ukraine. we are always vigilant. as you know, general breedlove, our allied commander has been tasked by nay tto to come up wi new additional options. he will be reporting those options become to me as well as, as, to nato. so -- we don't take anything for granted. >> hagel also says that over time western sanctions and russia's isolation from the world community will prove cost low for moscow. >> u.s. president barack obama is pledging to do more to address mental illness among military veterans.

that's because for the second time in less than five years, mr. obama traveled to fort hood, texas to honor the memory of u.s. army soldiers killed in a shooting there. army officials say the soldier accused of fatally shooting three people before killing himself last week had recently been examined by a psychiatrist. >> today four american soldiers are gone. four army families are devastated. 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, to deliver to them the care that they need and to make sure that we never stigmatize those who have the courage to seek help. >> officials say the gunman exhibited no apparent signs. he was about to commit violence. though he had a history of mental health, use. >> a critical day in the world's biggest election.

millions of indians are casting their ballots in 14 states including the capital region. this its the latest stage of the vote for new parliament. more than 800 million indians are eligible. officials staggered the election and spread the out over several weeks. >> here is an interesting story. in germany part of an art trove valued at $1 billion is now being returned to its elderly owner. >> german authorities had confiscated the collection from 81-year-old because they suspected it contained pieces looted by the nazis. gerlat kept it stashed in his plat for decade. >> he inherited it from his father who took orders from adolf hitler to buy and sell art to fund activities. it followed an agreement by gerlet to cooperate with international experts to det determine if the art was stolen. >> finding malaysia's missing

airliner would be one thing. >> the challenges will only increase if it is at the bottom of the indian ocean. coming up we'll look into this for you. >> plus, we are minutes away from the start of today's session of the oscar pistorius murder trial. this was him arriving at the courthouse just a few minutes ago. we will bring you live coverage when things get under way. please stay with us. ♪ ♪ [ female announcer ] with five perfectly sweetened whole grains... you can't help but see the good. to cover up flaws and make skin look pretty. but there's one that's so clever, it makes your skin look better even after you take it off.

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>> we are covering the effort to find the missioning airliner and if it is confirmed that flight 370 did in fact crash into the southern indian ocean, getting to the wreckage will be very difficult. >> yeah, one major reason for that, the treacherous terrain of the ocean floor. as we are about to show you, another reason the depth of the ocean itself. >> reporter: plunging to 15,000 feet below sea level a journey into an abyss. a journey few humans can comprehend. the boeing 777 is 200 feet wide, 242 feet long. possibly so deep under the indian ocean that you would pass the statue of liberty, the eiffel tower and the tallest building in the world in dubai on the way down. and still be only a fraction of the way to where the plane wreckage might be resting. keep plunging. you have entered a place sun light can't reach.

the pinger locator below that. 4,600 feet below the surface. marine biologist says at these depths marine life is unlook anything most people have ever seen. >> the deeper you go, you find, less and less, have to be cold tolerant. they might not have eyes. they might be blind. don't need to see. no light down there. keep going toward the ocean floor. at 12,500 is where you find the wreckage of the titanic which took some 70 years to discover and where it still rests today. if it were turned upside down at 14,400 feet where you would hit the iconic peak of washington state's mt. rainier. only after all that would you reach the spot where search teams believe pings from the flight data reporteder are coming from, 14,800 feet into the abyss. if that doesn't capture the magnitude of the search. imagine what one oceanographer described. picture yourself standing on one

of the highest peaks in the rocky mountains looking all the way down and trying to find a suitcase in the dark. >> that's not good. a lot of failures here. >> only a handful of people have traveled to the staggering depths or beyond. within of them is movie director james cameron. using a state of the art vessel he dropped 35,000 feet or about 7 miles to the deepest place on earth. he is turning the scientific mission into a movie. >> need to see what is there. beyond the edge of your lights. >> the pressure at nearly 15,000 feet is crushing. very few manned submarines can with stand it. >> there are only half a dozen subs that can go to basically half the ocean depths. with a number of countries having that capability. if it gets to the point of -- of collapse. it, basically implodes. it just -- crushes. >> finding the plane is

daunting. bringing it back from the deep, even more difficult. >> you really get an idea of the magnitude of this operation. the challenges are just enormous aren't they in this vast area of sea. >> and alluded to it. some of the experts say it. the ocean floor almost like an alien world. things there get crushed. we only a few people have reached the edges of it. that's the frontier for this search. >> cautious optimism on the part of australian authorities leading the search. >> indeed. you are all with us watching cnn newsroom. >> oscar pistorius is in the courtroom. saw him go in there. getting tried resume his test photest -- testimony. we will of course bring it to you all live from pretoria when we come back.

>> welcome back, you are watching cnn newsroom.

>> we want to welcome our viewers in the u.s. and around the world. here are the stories we are following for you right now on cnn. in the search for malaysian airlines flight 370, the hms echo is moving to the northern end of the search area supporting australia's ocean shield focusing on the area where four suspected pings have been picked up. >> authorities in pennsylvania say 16-year-old alex hribal went on a stabbing rampage at his high school wednesday. they don't know why. police say 20 students and one adult was stabbed in the attack. doctors say some of the injuries are life threatening. the teen is being charged as an adult. >> 92 seats in india's parliament decided as indians head to the poles fls today. the indian capital region among 14 states where people are casting their ballots. the country's five week marathon vote began monday and continues

until may 12th. we have our eyes fixed on the courtroom in pretoria south africa as we have at this time each day this week where oscar pro pistorius is on trial for murder. >> pistorius is expected to be back on the witness stand in just a few minutes. the prosecutor is due to continue his cross-examination. and we'll bring tight you. >> and it has been an emotional three days on the witness stand for pistorius. today looks to be more of the same. and reeva steenkamp's mother, what does she think of pistorius's testimony so far. she told the brit, newspaper "the mirror" quote, i look at oscar to see how he is copying and behaving. i am obsessed with looking at him. it is just instinctive.

i can't explain it. he has been very dramatic, vomiting and crying. i think he is just about keeping himself together. i don't know whether he is acting. our legal analyst kelly phelps giving us great context from outside the courthouse in pretoria and joins me now live. kelly, prosecutor, was very aggressive yesterday. talk us through what he accomplished, as far as what his strategy was? well he certainly accomplished getting under pistorius's skin, unnerving him, unsettling him. he was less composed, less eloquent when he was answering questions. the strategy behind that is clearly to try and trip him up if he is lying. so that he essentially talks himself around circles and then it is easier to expose inconsistencies and perhaps mistruths within his testimony. >> speaking of that. able to get pistorius to admit what he wroten his affidavit last year was different than

what he has been testifying this week as it relates to the fans orphan on the balcony went outside to bring it in or not. what's key about that? we don't know if that is key evidence or not. we know what he is trying to do. the beginning of a very important strategy of trying to place on the record a track record of inconsistencies between his various versions of events. at different stages in the criminal process. the implication of doing that is that -- if it can be shown that an accused person has essentially a track record of lying, then the only reasonable inference that a judge can draw from that is that, they must be guilty and covering up for themselves. having said that, one inconsistency or two, is not enough to achieve that strategy. the human memory is never faultless cote