The black boxes for a commercial flight that crashed into a military helicopter in Washington DC have been located.
Officials are still investigating the cause of the incident that killed all 67 people aboard the two aircraft.
The flight data recorder and the cockpit voice recorder, known as the black boxes, can help offer clues to investigators about what may have gone wrong on the flight.
The National Transportation Safety Board (NTSB) said a preliminary report will be issued in 30 days.
