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 has imposed permanent restrictions on non-essential helicopter operations around the Washington, D.C., airport where an Army chopper collided with a commercial jet

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

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.