The National Transportation Safety Board has released drone video of investigators surveying the wreckage of the Washington DC crash. The 29 January mid-air collision between a military helicopter and American Airlines passenger plane in Washington, DC killed 67 people.

Investigators are intensifying their search into what caused the collision between American Airlines Flight 5342 and an Army Black Hawk helicopter, with recovery crews still working to pull wreckage from the Potomac River and initial concerns already raised about the path of at least one of the aircraft.

Readings have been compared from the black box recovered from American Eagle flight 5342 and the air traffic control tower about the Black Hawk helicopter

Wednesday's deadly collision involving a U.S. Army Black Hawk helicopter outside Washington, D.C., followed the Army's highest rate of flight mishaps in more than a decade.

The National Transportation Safety Board is giving an update on the investigation into a collision between a passenger plane and an Army helicopter that killed 67 people last week. The crash happened after a Black Hawk helicopter carrying three soldiers collided with an American Airlines plane that was approaching a landing at Reagan National Airport in Washington,