Gunmen With Skeleton Masks Rob Clayton's Shop-N-Go

Clayton Police are looking for two men who used semi-automatic handguns in a robbery at in Clayton Station on Sunday night, said Sgt. Tim Marchut.

The two men entered the store around 9:15 p.m. A customer was walking out of the store when the armed robbers arrived. They told the man to go back inside and lay on the ground, as the gunmen took his wallet and cell phone.

One of the robbers stuck with the customer as the other went to the clerk and demanded money, which the clerk handed over. Nobody was injured during the robbery.

The gunmen wore all black, with hoodies and skeleton masks that covered their entire faces. They are believed to be average in height.

Clayton Police contacted the Walnut Creek Police Department K9 unit to try and track the suspects, but the scent went cold after 100 feet, which Sgt. Marchut said indicates the suspects likely left in a vehicle.

Police are reviewing grainy surveillance footage of the robbery.

About 15 minutes before the Stop-N-Go robbery, two armed robbers held up a cashier at the West Wind Solano 2 Drive-In Theater in Concord.

Those two suspects, described as black males wearing black hoodies and at least one wore a skeleton mask, fled on foot down Olivera Road, said Lt. Steve Dyer.

Dyer said it is also too early to tell whether Sunday night's robbery is linked to a string of armed robberies throughout Contra Costa County over the past two months. He noted that police arrested three suspects in those robberies on Thursday after another armed robbery at a Concord 7-Eleven.

He said there could be more suspects involved in those robberies than police originally thought.

The three suspects arrested last week are all teenage boys from Antioch -- one 16-year-old and two 17-year-olds. They are being held in juvenile hall, Dyer said.

--Bay City News contributed to this article.