The latest armed robbery to hit the Harvard area has prompted police to warn residents to stay clear of Cambridge Commons at night.

Two armed teenagers are accused of robbing a local man at gunpoint the night of Jan. 26, Cambridge police said.

One teen aimed a gun at the victim's back while the other searched through his pockets and stole his wallet.

The two fled towards Porter Square. There have been no arrests.

On Feb. 1, Cambridge police arrested a Dorchester man. He is accused of beating his girlfriend.

Police said that they used security cameras in the Cambridgeside Galleria mall to aid their case. They said the cameras show the girlfriend's swollen face as she walked with her boyfriend.

On Feb. 2., an employee of Dunkin' Donuts at Alewife told police that a fellow employee assaulted him "due to a delivery being late."

On Feb. 3, Cambridge police were called to mediate a roommate dispute. A woman told police that her ex-roommate came to her home and demanded a drum belonging to her.

The woman said she told her former roommate that she would give up the drum if she were paid for past phone bills.

The woman said her former roommate then became violent, kicking the woman in the groin and punching her.

On Feb. 3 at about 3:30 a bike was stolen from near the Carpenter Center on Quincy St. Police saw but did not catch the suspect.

There have been no arrests in a series of January jewelry store heists in the Square.

The stores hit are located on Arrow Street, Mt. Auburn Street and Church Street.

Police say the motive and means of the crimes were different, so they don't know if the same suspect committed them.

None of the crimes were committed in the presence of store employees.