The National Transportation Safety Board on Tuesday recommended that helicopter traffic be banned from a four-mile stretch over the Potomac River when flights are landing at Ronald Reagan National Airport.

Federal investigators looking for the cause of the January collision between a passenger jet and an Army helicopter near Washington, D.C., that killed 67 people are recommending a ban on some helicopter flights.

The National Transportation Safety Board said the separation between helicopters and jets in the area was insufficient and increased “chances of a midair collision.”

There's an "intolerable risk to aviation safety" with helicopters and planes flying too close to one another near DCA.

The National Transportation Safety Board is calling for a ban on some helicopter flights near Reagan Airport after an airliner and Army Black Hawk collided in January.

The NTSB’s preliminary report on the Jan. 29 crash that killed 67 people said current helicopter routes allowed around the airport are an ‘intolerable risk to aviation safety.’

The National Transportation Safety Board is seeking more flight restrictions on helicopters at around Ronald Reagan Washington National Airport.