Washington: President Donald Trump on Wednesday said the crash between a US Army helicopter and a passenger jet near Washington "should have been prevented."

"Why didn't the control tower tell the helicopter what to do instead of asking if they saw the plane. This is a bad situation that looks like it should have been prevented," Trump wrote on his Truth Social platform, adding: "NOT GOOD!!!"

A jet carrying 60 passengers and four crew members collided Wednesday with an Army helicopter while landing at Ronald Reagan National Airport near Washington, prompting a large search-and-rescue operation in the nearby Potomac River. There were multiple fatalities, according to a person familiar with the matter, but the precise number of victims was unclear as rescue crews hunted for any survivors. 

Three soldiers were onboard the helicopter, an Army official said. There was no immediate word on the cause of the collision, but all takeoffs and landings from the airport were halted while helicopters from law enforcement agencies across the region flew over the scene. Inflatable rescue boats were launched into the Potomac River from a point along the George Washington Parkway, just north of the airport, and first responders set up light towers from the shore to illuminate the area near the collision site. At least a half-dozen boats are scanning the water using search lights..

President Donald Trump said he had been “fully briefed on this terrible accident" and, referring to the passengers, added, “May God Bless their souls.”