U.S. authorities said on Thursday it was not yet clear why a regional jet crashed into a U.S. Army helicopter at a Washington airport, killing 67 people in the deadliest U.S. air disaster in more than 20 years.

The Federal Aviation Administration in a statement said American Airlines Flight 5342, departing from Wichita, Kansas to Washington, collided around 9 p.m. midair while approaching the runway with a Sikorsky H-60 helicopter.

DCA is one of the most demanding airports in the world. It also has what’s known as ‘helicopter alley’ with hundreds of police, military, news and rescue helicopters criss-crossing

A midair collision between an Army helicopter and an American Airlines flight from Kansas killed all 67 people aboard the two aircraft.

A jet with 60 passengers and four crew members collided with an Army helicopter carrying three soldiers while preparing to land at Ronald Reagan National Airport near Washington, D.

A regional jet carrying 64 people collided with an Army Black Hawk helicopter. Reagan National Airport grounded all flights.

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American Eagle flight 5342 collided with a Black Hawk helicopter over the Potomac River, home to some of the country's most restricted airspace.

An American Airlines jet carrying 64 people plunged into the Potomac River after colliding in midair with an Army helicopter on Wednesday night. Recovery teams had pulled more than two dozen bodies from the icy water,

Without evidence, Trump blamed air traffic controllers, the helicopter pilots and Democratic policies at federal agencies for Wednesday night's collision.

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Dozens of people — including more than a dozen figure skaters — were killed after a collision between an American Airlines passenger jet and an Army helicopter at Ronald Reagan National Airport near Washington,