OAKLAND -- Oakland police are asking for the public's help in finding a man and a woman suspected of robbing a North Oakland bank last month.

The pair is wanted in connection with a robbery at 12:25 p.m. Dec. 10 at a Bank of the West branch, said Oakland police spokeswoman Johnna Watson. Police distributed photos of the suspects on Wednesday.

Police said the man approached a teller window, said he had a gun and demanded money. No one was injured and a gun was never seen, police said.

The same branch, at 4900 Telegraph Ave., was robbed four times between Dec. 6 and Dec. 29, but investigators do not believe the crimes are linked. Police expect to release pictures of additional suspects in the other heists later this week, Watson said.

The bank was previously robbed Dec. 6, when a suspect escaped after a dye pack exploded as he fled the bank, and again on Dec. 21, when a pair of robbers, one armed with a gun, forced customers and employees to lie on the floor before fleeing with cash from tellers' drawers. The most recent robbery occurred at 10:20 a.m. Dec. 29, police said.

The male suspect is described as an African-American, 34 to 37 years old, roughly 5 feet 8 to 5 feet 10 inches tall with a medium build. He appeared unshaven with a moustache. He was wearing a black beanie and a large black jacket with a light colored shirt.

The female suspect is described as an African-American in her late 20s, 5 feet 5 inches tall and weighing about 170 pounds with large eyes and possibly wearing a wig.

The Oakland Police Department and Crime Stoppers of Oakland are offering a reward of up to $2,500 for information leading to an arrest or arrests in this case. Anyone with information should call the major crimes unit at 510-238-3326 or 510-238-3326 or email ncalonge@oaklandnet.com. Tipsters can also call Crime Stoppers of Oakland at 510-777-8672 or 510-777-2805.

Reach Kristin J. Bender at kbender@bayareanewsgroup.com. Follow her at Twitter.com/kjbender.