DENVER -- Boulder police released surveillance photos of a man who robbed a Chase bank in Gunbarrel, hoping someone will recognize the suspect.

The robbery happened at the Chase Bank at 6300 Gunpark Drive around 3:40 p.m. Tuesday.

The gunman walked into the bank, approached a teller and demanded money, said Boulder police spokeswoman Sarah Huntley.

He then escaped with an undisclosed amount of cash, she said.

No one was injured.

The gunman has been described as a white male, about 5 feet, 10 inches, and 180 pounds. He was wearing a dark hat and mask that covered most of his face, gloves, blue jeans and a tan or brown jacket. The jacket may have been a faded Carhartt jacket, waist length with no collar. Witnesses have said he had a deep voice and was carrying a dark-colored, round bag, Huntley said.

Those with information who wish to remain anonymous should contact the Northern Colorado Crime Stoppers at 1-800-222-TIPS (8477) or 1-800-444-3776. Tips can also be submitted via the Crime Stoppers Web site at www.crimeshurt.com.