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.

Helicopters will be permanently restricted from flying near Washington, D.C.'s airport on the same route where a passenger jet and an Army helicopter collided in midair, killing 67 people, the Federal Aviation Administration said Friday.

The closure of the helicopter route near the airport makes permanent the restrictions put in place after Jan. 29 midair collision.

The US Federal Aviation Administration (FAA) has permanently restricted non-essential helicopter operations around Reagan National Airport following a deadly mid-air collision with an American Airlines regional jet in January.