karen travers is there. >> tonight this stunned pittsburgh community gathered to pray for the victims of today's bloody violence. just after 7:00 a.m. before the classes even started, franklin regional high school went on lock down. >> people were running everywhere. no one knew what to do. it is unbelievable. >> police say the assailant was the 16-year-old sophomore. he ran through the halls wielding two 8 to 10-inch knives. 22 people were stabbed. a security guard and 21 students. >> there was blood where the double doors are all over the wall. >> it was blood everywhere. >> tonight the school's assistant principal is being called a hero for tackling the suspect and stoping his spree. >> mr. king immobilized and i pinned him down and held down his wrists and arms and tried to keep the knife stationary. >> people were crying. >> audio captured the chaos. >> i don't know what i got down here at the school, but i need somebody here asap. >> officials say this could have been worse. during the attack a student pulled the fire alarm. police say that helped quickly evacuate the school. >>

karen travers is there. >> tonight this stunned pittsburgh community gathered to pray for the victims of today's bloody violence. just after 7:00 a.m. before the classes even started, franklin regional high school went on lock down. >> people were running everywhere. no one knew what to do. it is unbelievable. >> police say the assailant was the 16-year-old sophomore. he ran through the halls wielding two 8 to 10-inch knives. 22 people were stabbed. a security guard and 21 students. >> there was blood where the double doors are all over the wall. >> it was blood everywhere. >> tonight the school's assistant principal is being called a hero for tackling the suspect and stoping his spree. >> mr. king immobilized and i pinned him down and held down his wrists and arms and tried to keep the knife stationary. >> people were crying. >> audio captured the chaos. >> i don't know what i got down here at the school, but i need somebody here asap. >> officials say this could have been worse. during the attack a student pulled the fire alarm. police say that helped quickly evacuate the school. >>

karen travers is there. >> tonight this stunned pittsburgh community gathered to pray for the victims of today's bloody violence. just after 7:00 a.m. before the classes even started, franklin regional high school went on lock down. >> people were running everywhere. no one knew what to do. it is unbelievable. >> police say the assailant was the 16-year-old sophomore. he ran through the halls wielding two 8 to 10-inch knives. 22 people were stabbed. a security guard and 21 students. >> there was blood where the double doors are all over the wall. >> it was blood everywhere. >> tonight the school's assistant principal is being called a hero for tackling the suspect and stoping his spree. >> mr. king immobilized and i pinned him down and held down his wrists and arms and tried to keep the knife stationary. >> people were crying. >> audio captured the chaos. >> i don't know what i got down here at the school, but i need somebody here asap. >> officials say this could have been worse. during the attack a student pulled the fire alarm. police say that helped quickly evacuate the school. >>

>> karen travers, thank you. >>> business news starting with twitter.essaging service could be under pressure after the company released a mixed first quarter earnings report. analysts have concerns about the ability to grow its user base. after it was released, twitter shares dropped to $38 each. now, if they open at that level today, it will be the stock's lowest point since twitter went public last fall. >>> jurors in the silicon valley resume deliberations in the faceoff between apple and samsung. apple accuses samsung of ripping off smartphone technology developed by steve jobs and other apple geniuses and is demanding 2.2 billion in damages. samsung denies that and says apple stole two of its patents and it is suing for $6.2 million. >>> apple rolled out the new line of mac book air laptops and dropping the starting price by $100. the tech giant says the updated air models have more powerful processors and as much as two more hours of battery life. >>> the group here in the big apple that organizes the annual subway ride in your underwear is at it

karen travers has the top story. >> reporter: secretary of state john kerry said ukraine is doing its> let me be clear. if russia continues in this direction, it will not just be a grave mistake, it will be an expensive mistake. >> reporter: president obama was asked whether more sanctions could fail to influence president putin. the president acknowledged -- >> that's possible. >> reporter: later in moscow, putin was defiant. he said the u.s. and european sanctions are having some effect on the russian economy but it's nothing quote critical for now. ukraine launched a military operation aimed at pushing pro russian insurgents out of the buildings they occupy in the eastern part of the country. at least two pro russian militants were killed. putin said there will be consequences. russia quickly announced it would start military drills along the border of southeastern ukraine. news that american journalist simon ostrovsky was released by the pro-russian insurgents who held him captive since tuesday. ostrovsky has been reporting from eastern ukraine which has been increasingly dangerou

. >> abc news reporter karen travers joins us with the latest. karen? >> good afternoon. just moments ago, the 16-year-old was charged as an adult in a pennsylvania courtroom with four counts of attempted criminal homicide. 21 counts of aggravated assault, and he was denied bail. school officials said when he was taken into custody when tackled by a principal, he told them he wanted to die. now, people here in this community are asking one question. why did he do it? classes had not yet started this morning at franklin regional high school. chaos, and violence, erupted. >> we went in front of the school the teacher started running out. people running everywhere. >> word spread people were being stabbed inside of the school. police say the suspect is a 16-year-old sophomore. >> juvenile. went down the hallway. flashing two knives around. >> the suspect was taken into custody. his name has in the yet been released. 0 people were hurt, 19 students, and one adult the security guard. at least four people with serious injuries were flown to area hospitals for treatment. doctors

abc news reporter karen travers has more. >> reporter: two pings in the indian ocean.ight 370? >> this is a most-promising lead probably in the search so far. >> reporter: australian authorities said one of the vessel was an american ping locator heard two separate signals >> that would be consistent with transmissions from both flight data recorder and cockpit voice recorder. >> saturday night into sunday crews heard something like this. the first signal lasted two hours, 20 minutes the ship turned, picking up another signal for 13 minutes two pings about a mile apart. now, this navy ship, ocean shield is zoning in on a shawl area just three square miles of the indian ocean. waters are deep now, but the teams want to hear a third ping. that will allow them to triangulate where signals are coming from. >> that will be the trigger at the moment to launch the underwater vehicle with a more active sonar and phone shally camera for mapping and looking at the ocean floor. >> batteries in the black boxes expected to be at full strength only through last weekend but manufactu

karen travers, abc news washington. >> the recovery crew lacking for malaysian air lane flight 370 facing a new time crunch to find missing jet. battery in the black box that give off audible ping only to last for 30 days. that means the ping could fall silent by this sunday. today high tech equipment aboard ship searching the deep water indian ocean being dragged through the water hopping to catch some of that pinging. plane disappeared 4 week ago today after leaving for beigian. when the battery rundown it's going to be even more difficult to find the plane. however, as wayne found out today in alameda it won't be impossible. >> it is a contraption that appears unsuited for anything except toppling over but this is remotely operated vehicle that could find and help recover malaysian flight 370 far beneath the surface of the indian ocean. >> different technique we can use. we can use pieces larger than the vehicle itself. >> she runs research in alameda under water intimately familiar with the difficulty of searching in deep world trade center for an airliner with black box soon to be vi

karen travers joins us with a wrap-up. good morning, karen. >> good morning, john.the white house expected a surge of traffic at healthcare.gov, yesterday and they got it. three times more users than the previous peak day. for those able to successfully enroll in the plan, their coverage will begin may 1st. >> reporter: sign up for health insurance or face a penalty. the obama administration making one final push. including vice president biden stopped by a health care enrollment center here in washington. >> i just wanted to come by and say, you're doing the right thing. you're doing the right thing. >> reporter: administration officials said the traffic at healthcare.gov was three times the previous peak day. they said the site could handle the last-minute surge but in a flashback to the technical glitches of last fall, an error message. officials say this is due to scheduled maintenance. and another problem, users couldn't create new accounts. that was resolved in an hour. in many states, there were lines at signup centers. >> people were here before the doors op

karen travers, abc news washington. >> the widow of an american man killed in afghanistan says she bearsl will to the security guard who shot her husband. one of 3 doctors killed today at cure international hospital in kabu kabul. lateness a deadly string of violence aimed at non-military foreign national in this case volunteer doctors trying to help afghan children. doctors include add father and son and pediatrician from chicago. >> like to start by saying our family has suffered a great loss. our family and friend have suffered a great loss. our hearts are aching. we don't hold any ill will towards afghanistan in general. or even the gunman who did this. >>reporter: gunman was security guard hired to protect the hospital and even after the attack the doctors tended to him. >> well now to the new warning to american family and their doctors from the cdc about measles. tonight we track a surge of cases outbreak in 13 states with california and new york hardest hit. number of cases is growing at pace not seen in nearly 20 years too. so how far could this go and how fast? of dr. richard v

abc's karen travers joins us from just outside the scene. we spoke to many people here in murrysville yesterday, and one woman said it seems trite and almost generic because after almost every tragedy like this, she was wondering how something like this could happen in a town like murrysville. this stunned community gathered to pray for the victims of bloody violence. >> bring healing to our region. >> reporter: just after 7:00 a.m. before classes even started, franklin regional high school went on lockdown. >> people were running everywhere. no one knew what to do. it -- it's unbelievable. no one knew that it was happening. it -- it -- >> reporter: police say the assailant was 16-year-old sophomore alex hribal. he ran through the halls wielding two eight to ten-inch knives. 22 people were stabbed, a security guard and 21 students. >> there was blood right where the double doors are, all over the wall. >> reporter: the school's assistant principal, sam king, is being called a hero for tackling the suspect and stopping his spree. >> mr. king

with more karen travers. >> reporter: vice president biden touched down in ukraine to reaffirm the commitmentration continues to point fingers at russia for the ongoing tensions releasing images of soldiers in eastern ukraine that it says are russian forces. >> there's a strong connection between russia and the armed militants that we've seen in eastern ukraine, crimea and other places. this is further photographic evidence of that. >> reporter: biden's visit comes on the heels of a fire fight at a check point that left at least three people dead. pro-russian forces say they were ambushed outside of a town they control. moscow said the attackers were from a far-right nationalist group that's aligned with the new ukrainian government. russia's foreign minister said this is the u.s.'s fault and called on the obama administration to fully accept responsibility for the new ukrainian government it brought to power. over the past two weeks, pro russian forces have seized a dozen government offices and raised the russian flag. the white house said militants in eastern ukraine must comply with the re

here's abc's karen travers. >> reporter: in kathmandu, a somber farewell for more than a dozen fallenof mourning after last friday's tragic avalanche that took the lives of 13 of their colleagues. just after 6:30 a.m. last friday, near what's called camp one at about 19,000 feet, a glacier gave way sending snow and ice careening down the mountain. >> the cloud was coming down. and yeah for a few seconds i thought this is going to take me out and my sherpa. >> reporter: adventurers have long relied on sherpas to help them scale the tallest peak. of course there is significant danger involved not just avalanches but falls and injuries from the heavy loads. this sherpa said their life is quite risky and not easy. >> without the sherpa community and the climbing sherpas to put in the route, ferry supplies, build and stock the camps and assist western climbers, most people wouldn't climb everest. >> reporter: now a potentially unprecedented walkout. they want a relief fund for the families of those killed or injured during climbs. they want more insurance money. nepal agreed to pay the fam