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.

The NTSB released a preliminary report on the DCA collision between a plane and helicopter in January while giving urgent recommendations to the FAA.

The release of the reports followed a news conference by NTSB officials who said Federal Aviation Administration procedures that governed the airspace near Reagan National Airport before the crash allowed for an “intolerable risk” that increased the chance of midair collisions,