Boston Police report arresting a trio of Dorchester teens (17, 15 and 15) on charges they mugged a woman at a bus stop on Cambridge Street in Allston shortly after 9 a.m. yesterday.

Also arrested yesterday: A tough-talking teen who started swearing at a cop in a Dorchester District Court hallway. And one Mario Gaston Porrata, 25, charged with grabbing a woman's purse around 7:30 p.m. at E. Newton and George streets in the South End.