HOOKSETT, N.H. (AP) -- New Hampshire state police are investigating a robbery at the Hooksett Toll Plaza on Interstate 93.

Police say a male suspect approached the toll booth on foot just after 1 a.m. Monday, displayed a handgun and took an undisclosed amount of cash.

The toll attendant was not hurt.

Police say the suspect fled on foot.

A search of the area, which included a state police canine, failed to find the suspect.

The suspect is described as a white male of medium build who was wearing a black plastic face mask, shorts and a dark colored T-shirt.