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.

WASHINGTON, D.C. — The National Transportation Safety Board chairman called for immediate changes at Washington, D.C.'s Ronald Reagan Washington National Airport, saying the current helicopter routes around the airport "pose an intolerable risk to aviation safety."

The agency says the approved helicopter route is too close to the approach to the runway where an American Eagle plane was attempting to land in January.

U.S. Transportation Secretary Sean Duffy on Tuesday said the agency will make permanent restrictions to prevent helicopters from flying near Washington Reagan National Airport when two lesser-used runways are operational,

US air crash investigators have recommended restricting helicopter flights in certain areas near Washington DC's Reagan National Airport following January's deadly mid-air collision. Citing an "intolerable risk to aviation safety",

The NTSB is expected to give an update on the midair collision between a passenger plane and helicopter over Washington, D.C. in January.

Watch live coverage as officials provide an update after an American Airlines flight collided with a military helicopter near Washington, D.C.’s Ronald Reagan National Airport, killing all 67 people aboard.

The January midair collision with the Army helicopter happened as the American Airlines jet was about to land at Ronald Reagan Washington National Airport. All 67 people on both aircraft died.