PACHECO (CBS SF) — A suspect who pulled off a brazen armed robbery at an East Bay casino early Monday morning remained at large, authorities said.

At around 4:45 a.m. Monday morning, police responded to an armed robbery reported at the California Grand Casino located at 5988 Pacheco Boulevard.

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A perimeter was quickly set up and casino customers were evacuated.

No one was injured and no shots were fired, but staff and patrons said a man wearing a Halloween mask and orange gloves and carrying a semi-automatic rifle entered the casino’s 24-hour card room.

“The person came in with a weapon and pointed it at some of the staff and some customers as well. It was very frightening,” said Contra Costa County Sheriff’s office spokesperson Jimmy Lee. “We got out here as quickly as we could, but by the time we got out here, the suspect was gone.”

The sheriff’s office released surveillance images from the robbery late Monday morning. While details were difficult to make out in the dark photos, the orange gloves and face mask the suspect wore were visible.

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In the video, the man is seen entering the casino and going straight to a table before taking money and fleeing.

Investigators didn’t say exactly how long the robbery took. Authorities were still reviewing the surveillance footage.

Police described the man as approximately six feet tall and 200 pounds. He was wearing a black hoodie and dark pants at the time of the robbery.

surveillance image of suspect vehicle in Pacheco casino robbery on April 25, 2016 (Contra Costa County Sheriff's Dept.)

surveillance image of suspect vehicle in Pacheco casino robbery on April 25, 2016 (Contra Costa County Sheriff’s Dept.)

Surveillance cameras caught the suspect driving away in a silver four-door sedan. Police said they believe it is a BMW or Mercedes Benz.

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Anyone with information about the crime is asked to call the Contra Costa County Sheriff’s Department.