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 .

A PSA Airlines Bombardier CRJ700 regional jet collided with a Black Hawk helicopter while on approach at Reagan Washington National Airport at about 9 p.m. Wednesday.

He indicated 27 bodies had been recovered from the airplane, and one from the helicopter.