CAMBRIDGE, Mass. (AP) — Cambridge police say a man who may be responsible for nearly two dozen convenience store robberies in the region this year has struck again.

The suspect robbed a store on Cambridge Street on Monday night and got away with $100.

Police say he lifted his sweat shirt to show the handle of what appears to be a gun.

Authorities believe it is the same man who has been involved in 21 other robberies at stores in Boston, Chelsea, Everett and Lynn since February. In many instances, the stores were robbed at gunpoint.

The suspect is described as a black male, about 5-feet-10, with a thin mustache.

Police ask anyone who recognizes the suspect from surveillance photos to contact police.