National Transportation Safety Board investigators issued a pair of “urgent” safety recommendations for helicopter paths on Tuesday as part of their preliminary report into the deadly midair collision over the Potomac River in January.

Helicopters should not be allowed to travel over a four-mile stretch over the Potomac River following the deadly air collision near Washington in January, according to urgent safety

Federal investigators looking into the cause of the January collision between a passenger jet and an Army helicopter near Washington, D.C., that killed