The flight data recorder and cockpit voice recorder, known as the black boxes, may offer clues about what went wrong before the crash.

Officials say the conditions of the Potomac River are complicating recovery efforts of the bodies of the 67 presumed dead in a mid-air collision between American Airlines flight 5342 from Wichita and a military Black Hawk helicopter.

This afternoon the NTSB held its first briefing on the crash saying this was a very quick and rapid impact. Since Wednesday night they have been dealing with difficult conditions. Despite that, the DC fire chief says he is confident the remains of everyone involved will be found.