Officials say the airport is operating normally but stress that passengers should check with their airlines for delays or cancellations.

At least one aircraft crashed Wednesday evening over the Potomac River near Ronald Reagan International Airport outside Washington, D.C., officials said, grounding all flights at the airport. The District of Columbia Fire and Emergency Medical Services Department reported in a social media post that a small aircraft crashed in the Potomac River in the "vicinity" of the airport.

An American Airlines regional passenger jet and a U.S. Army Black Hawk helicopter crashed into the frigid Potomac River after a midair collision near Reagan Washington National Airport on Wednesday night,

A small aircraft crashed in the Potomac River near the vicinity of Ronald Reagan Washington National Airport on Wednesday night, authorities said.

There was no immediate word on the cause of the collision, but all takeoffs and landings from the airport were halted as dive teams scoured the site and helicopters from law enforcement agencies across the region flew over the scene in a methodical search for bodies.