The National Transportation Safety Board has released their preliminary report into the deadly midair collision between an American Airlines flight and a U.S. Army Black Hawk helicopter over Washington,

The deadly crash took place in January when a military helicopter collided with a passenger jet, killing 67 people.

Helicopters should be barred from a four-mile stretch over the Potomac River when flights are landing on Reagan National Airport’s Runway 33, National Transportation Safety Board Chair Jennifer Homendy said as the NTSB unveiled “urgent safety recommendations” after the deadly mid-air collision in January.