An East Boston man who was chased down by two Boston cops working a police detail after he allegedly groped a woman yesterday morning is being eyed as the attacker who sexually assaulted three victims on Labor Day, officials said yesterday.

Carlos Alfredo Bonilla, 18, was nabbed just after 8:44 a.m. after a terrified woman screamed for help and told cops what happened. She described her assailant as a Hispanic man with short black hair, a diamond earring in his left ear and a black T-shirt with white and green lettering, jean shorts and a backpack with the initial R.W., police said.