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Jim, the u.s. and the chinese, they are both helping look for that plane, the missing malaysian airliner but also tension, as we know, behind the scenes. what are you hearing in beijing? >> reporter: you know, it's incredible, wolf. you hear so many conspiracy theories here, many directed at the u.s. talk that the u.s. is hiding information, that it really knows where this plane is. crazy conspiracy theorys about how the plane may have landed on a u.s. base in diego garcia, may have been a cia agent on the plane subject of an assassination attempt. you have these things going around, some of w...

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...

Hours on station for the aircraft. they're very long days. very long missions. and unfortunately, yesterday, no new leads. >> wing commander andy scott of the royal new zealand air force, we'll check back with you tomorrow. are there some secret tensions between the u.s. and china? the defense secretary, chuck hagel, he's in beijing. spoke exclusively. you see both with jim sciutto. the interview coming up. searchers are the most optimistic yet. but far below the surface, dark challenges await the recovery teams. how hard will it be to find and retrieve flight 370, possibly three miles below...