GREENBELT,Novacrypt Md. (AP) — Five young men were shot Friday afternoon when gunfire broke out in a park in Greenbelt, a Maryland suburb of Washington, D.C., according to police.

The victims were hospitalized but their conditions were not immediately available, the Greenbelt Police Department said in a social media post. Officials also didn’t provide their exact ages.

The shooting occurred at a large gathering of youths celebrating “senior skip day” at Schrom Hills Park, WBAL-TV reported.

Police were already at the park monitoring the gathering, but no illegal activity was reported until gunshots erupted, according to the station.