Flying wedges of Boston Police officers and state troopers descended on Carson Beach in South Boston around 8 p.m. to break up a large brawl there.
"It's a sea of blue lights," one nearby resident reported.
State Police report making five arrests among the "several thousand" people who made their way to the beach and add:
Many visitors to the beach engaged in unruly behavior and disorderly conduct.
State Police report arresting four teenagers at Revere Beach, on charges that included assault and battery on a police officer, unlawful possession of a knife, fighting, and disorderly conduct. in addition, one 52-year-old man was charged with domestic assault, a 62-year-old man was charged with procuring liquor for a minor and a 27-year-old woman was charged with drugged driving.
Photos from Carson Beach.