A group of masked Massachusetts teenagers stormed a McDonald’s restaurant and attacked an employee who was behind the counter during the chaotic invasion caught on camera. Four teens were arrested for their roles in the violent takeover in Lynn — about 10 miles outside Boston — on Sept. 18 after a local football game let out, WHDH reported. Distressing cellphone footage recorded from inside the McDonald’s shows the massive group descending into the fast-food joint before two of the teens are seen viciously attacking one of the workers.