Federal authorities have restricted helicopter flights near Ronald Reagan Washington National Airport. The move comes days after a deadly collision between a passenger jet and a military helicopter.

An Army Black Hawk helicopter collided midair with an American Airlines flight from Wichita, Kansas, at Reagan National Airport on Wednesday.

The crash around 9 p.m. threw one of the world's most tightly controlled airspaces into chaos, 3 miles south of the White House and U.S. Capitol. Officials were probing the cause Friday as they searched the river.

An American Airlines plane carrying 60 passengers and four crew members collided with an Army Black Hawk helicopter outside Reagan National Airport near Washington, D.C. Wednesday night. A D.C. fire official said Thursday that “we don't think there are any survivors from this accident" and "we are switching from a rescue operation to a recovery operation.

A fatal midair collision between a commercial passenger jet and Black Hawk military helicopter near Ronald Reagan Washington National Airport in Washington, D.C., forced air traffic to grind to a halt on Wednesday night.

There was no immediate word on the cause of the collision, but all takeoffs and landings from the airport were halted as dive teams scoured the site and helicopters from law enforcement agencies across the region flew over the scene in a methodical search for bodies.