The U.S. Marshals Service says one of its employees was photographed having sex on the roof of a federal courthouse in Pennsylvania.

A resident of a nearby apartment building who was concerned that there was a security breach snapped the pictures this week and sent them to WHTM-TV in Harrisburg, which alerted authorities.

U.S. Marshal Martin J. Pane issued a statement Thursday confirming the employee's involvement. He said the matter is under investigation.

The photos depict a couple engaged in sex acts on the roof of the Ronald Reagan Federal Courthouse in Harrisburg.