AP source: Missile took down jet in Ukraine

WASHINGTON (AP) — American intelligence authorities believe a surface-to-air missile took down a passenger jet in eastern Ukraine on Thursday, a U.S. official said, but the Obama administration was still scrambling to confirm who launched the strike and whether there were American citizens killed in the crash.Vice President Joe Biden said the incident was "not an accident" and described the Malaysia Airlines plane as having been "blown out of the sky."