The agency is calling for the suspension of helicopter traffic along the route used by the Army helicopter that crashed

The National Transportation Safety Board issued urgent safety recommendations Tuesday, warning that helicopter flights near the Ronald Reagan Washington National Airport pose serious safety risks and one helicopter route should be closed during airport operations.

A medical transport helicopter crashed Monday in Mississippi, while carrying two hospital workers and a pilot, officials said.

Three people aboard a medical helicopter were killed when the aircraft crashed in rural Mississippi, officials said.