Surveillance photo of the suspect in the armed robbery of the 7- Eleven store on Watkins Mill Road in Montgomery Village on Oct. 12. (Courtesy Montgomery County Police)

The first incident occurred on Oct. 12 at about 11:43 p.m. Police said a man entered the 7-Eleven located at 19235 Watkins Mill Rd. in Montgomery Village, displayed a sawed-off shotgun and demanded money from the cashier.

The suspect demanded that the cashier put the money in a white plastic bag that he pulled from his pocket. He was last seen running across the parking lot towards Watkins Mill Road.

The suspect is described as a black man, 25 to 30 years old, 6’ to 6’2” tall and weighing approximately 160 to 180 pounds. Police said he was wearing a dark-colored, quarter-length pea coat and blue jeans. He also wore a black scarf or cloth over his face, black sunglasses and black gloves, police said.

The second robbery occurred on Oct. 27 at about 1:41 a.m., this time at the 7-Eleven located at 9051 Snouffer School Road in Gaithersburg.

Again, police said, the suspect entered the store with a sawed-off shotgun and demanded money be placed in a white plastic bag he pulled from his pocket.

In the Snouffer School Road case, a witness who exited the 7-Eleven prior to the robbery reported seeing two men outside the store wearing black masks, police said.

The suspect who entered the store is described as a light-skinned man, 5’8” tall, and wearing a black jacket and mask. The man who remained outside was described as being dressed in all black with a black face covering and dark sunglasses.

Based on the witness’s report, detectives said they believe that the two robberies are related. The two men are believed to be working together and using the same weapon; one robs the store while the other waits outside.

Anyone with information about the robberies or the suspects can call 240-773-5100 or 1-866-411-TIPS (8477).