Police said a man was struck by a car and killed while crossing a road in the Adelphi area of Prince George's County Thursday evening by two cars in succession.

The man was crossing New Hampshire Avenue at Metzerott Road when a car headed south struck him, said Cpl. Tyler Hunter, a spokesman for the Prince George's County police. The man, already down in the road, was struck by a second vehicle that kept going, police later said on Twitter. The driver of the second vehicle, a small sedan, may not have realized what had happened, according to police.

Officers, alerted to the accident at around 7:30 p.m., found the man unresponsive and pronounced him dead at the scene.

Hunter said the driver of the car that hit the man initially remained at the scene and was cooperating with investigators, who shut down southbound lanes of New Hampshire Avenue while they collected evidence. They were attempting to determine if the man was in the crosswalk and who had the right of way when he was hit.

Police were not releasing the man's name until his family could be notified.