Boston Police report arresting a fourth man, from Dorchester, for his alleged role in gunfire that forced a halt to Charlestown High School graduation just as it was to begin in June.
Police say detectives and gang-unit officers arrested Austilino Pereira, 21, Friday morning. Armed with a search warrant, they found a loaded gun, drugs and currency in his Dorchester home, police say, adding police have now recovered three guns from a dozen or so suspects they say were involved in a gun battle along Polk Street around 4 p.m. on June 13, just as graduates and their families and friends were assembling at the high-school field at the end of the street.
At least one of the people arrested in connection with the gunfire is a former Charlestown High School student.
Pereira is not unknown to police. On Sept. 26, he was arrested on a variety of driving infractions, including driving the wrong way down a one-way street, in an allegedly vain attempt to evade police because the other guy on his scooter, a 14-year-old, was packing a loaded gun as they and other scooter riders allegedly threatened bystanders in the area of Helen Street in Dorchester.