Get all the news you need in your inbox each morning. Federal aviation investigators vowed earlier in the day that they will find the cause of a horrific collision. NTSB Chairwoman Jennifer Homendy said at a briefing that the agency wants to assure the American public it will "leave no stone unturned in this investigation .

There were 64 people on American Airlines Flight 5342 from Wichita, Kansas to DCA — including 60 passengers and four crew members. The Blackhawk Army helicopter had three soldiers on board. None of the 67 people on either aircraft are believed to have survived, officials say.