--Four people, among them three juveniles, have been arrested for the fatal shooting of a man in Cambridge at Windsor and Howard Friday night. The victim was 18-year-old Lucien Christalin, of Mattapan. A spokesperson for the Middlesex DA said "the victim and shooter knew each other." [Boston Herald, Cambridge Chronicle]

--The BPD swept the Boston Common, aka Deval's Front Yard, and made 10 arrests. [BPD News]

--Police nabbed a notorious sex offender at a motel in Malden yesterday. He had several outstanding warrants for various charges. [AP/Boston Globe]

All charges alleged until proven under law.