CNN The Situation Room April 9, 2014 21:17:00
Sophomore allegedly went on a stabbing spree, stabbing 19 or 20 of his fellow students as well as a security guard and, as you heard the police chief tell us, from the murrysville police department, two of those people, two of those young people are in critical condition right now. we're going to stay on top of the story. much more on this coming up. it's a shocking development in our country at this time. also another story we're following right now, there's new optimism in the search for flight 370 after two new underwater pings have been detected. also a new reason for urgency in the search...