Man sought in 21 convenience store robberies

"Police are seeking the public’s help in identifying a man believed to have robbed at least 21 convenience stores since February, brandishing a gun in many of the crimes.

Cambridge, Boston, Chelsea, Everett, and Lynn police are searching for a dark-skinned black man, about 5 feet 10 inches tall, with a thin mustache, Cambridge police said in a statement. In surveillance photos released by police, he can be seen wearing large sunglasses, with a coat or sweat shirt with its hood up or a baseball cap."