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Police are seeking information on a suspect who robbed a downtown bank earlier this week. (Oakland Police Department)

OAKLAND -- Police on Friday released surveillance photos and offered a reward for the capture of a man who robbed a downtown bank earlier this week.

The robbery happened about 11:45 a.m. Tuesday at the Mechanics Bank, 1999 Harrison St.

Police said the man demanded money from a teller and fled with an undisclosed amount of cash.

The robber is described as black, 40 to 49, about 5-foot-8 with a large build. He was bald, had a mustache and was wearing a blue striped, short-sleeve pullover shirt.

He was last seen walking in the area of 20th and Harrison streets.

Police said there are no reports of the man being involved in other robberies.

Police and Crime Stoppers of Oakland are offering up to $2,500 in reward money for information leading to the arrest of the robber. Anyone with information may call Officer Doug Keely at 510-238-3326 or 510-2387959 or a tip line at 510-773-2805.