A masked man robbed a 7-Eleven in Hauppauge early Monday morning, injuring the clerk on duty.

According to the Suffolk County Police Department, the masked suspect, who was also wearing a black hooded sweatshirt, black pants and sunglasses, entered the convenience store on Townline Road shortly before 2 a.m., displayed what appeared to be a gun and demanded cash from the clerk. After the clerk complied, giving him cash from the drawer, the assailant fled on foot, heading west on Townline.

The clerk suffered a minor injury during the holdup, police said. He was treated at Stony Brook University Hospital and released.

Police described the robber as being about 6 feet tall and having a thin build.

Detectives from the SCPD’s 4th Squad are investigating the robbery. Anyone with information is asked to call them at 631-854-8452, or to call Crime Stoppers anonymously at 800-220-TIPS.