U.S. Park Police say a man was fatally struck by two U.S. Secret Service vehicles at a Suitland Parkway intersection.

Secret Service spokesman Malcolm Wiley says the two armored vehicles were traveling from Andrews Air Force Base to a Washington garage when the pedestrian was hit around 2:30 a.m. Wednesday at the intersection of Suitland Parkway and Naylor Road in Temple Hills.

Wiley says the vehicles were returning from a vice presidential trip to Fort Lewis in Washington state. He says the Secret Service employees driving the vehicles immediately stopped to help the man.

The man was taken to Prince George's Hospital Center, where he was pronounced dead.

The cause of the crash is still under investigation.

The pedestrian's identity has not been released.