A U.S. House of Representatives oversight subcommittee said on Thursday it is investigating the collision in January between an Army Black Hawk helicopter and an American Airlines regional jet that killed 67 people near Ronald Reagan Washington National Airport.

An American Airlines passenger jet and an Army helicopter collided on Jan. 29 as the plane prepared to land at Washington, D.C.’s Ronald Reagan National Airport.

The Federal Aviation Administration (FAA) has announced that helicopters would be permanently banned from flying near Ronald Reagan National Airport

The NTSB pointed out that the current flight paths of helicopters near Washington-National provide only 75 feet of separation from landing aircraft.

The Federal Aviation Administration says helicopters will be permanently banned from flying near Washington, D.C.’s airport on the route where an airliner and an Army helicopter collided in midair.