Maryland State Police have updated their description of a shotgun-and-hammer-wielding suspect who yesterday smashed the windshield of a speed camera-equipped Jeep SUV, shutting down the Baltimore-Washington Parkway for more than three hours as authorities searched for the man.

The suspect is a white male, about six feet tall, weighing 200 to 220 pounds, possibly with a pot belly, police said. He is believed to be in his 50s or 60s and was wearing clear glasses. He may have been carrying or wearing a dark backpack.

He also wore a red-and-blue plaid shirt and blue jeans.

The SUV was parked along the BW Parkway near a construction zone at Route 195. The suspect came out of a nearby strip of woods wielding a shotgun and a hammer about 11:30 a.m. Wednesday. He began tapping on the rear of the Jeep with the shotgun, Maryland State Police spokesman Greg Shipley said. A state contractor who was in the Jeep at the time became frightened and started blowing his horn.

“The suspect then came to the front of the Jeep and began yelling incoherently and smashing the windshield with the hammer,” Shipley said.

The windshield shattered, Shipley said, and the worker got out of the car and crouched by the guardrail for cover. The man with the hammer and gun then left.

State police investigators, who set up a search without success, now believe that after the incident, the suspect walked back through the woods to a parking lot in the 1300 block of Concourse Road. He may have parked a car in the lot there and then left.

Police believe there are witnesses to the incident who were driving by at the time, and they are asked to contact the Maryland State Police at the Glen Burnie Barrack, at 410-761-5130.