It sounds like this group of 'teens' regularly go through the neighborhood causing trouble -- at least according to the article:

From the article:

The police report states that Boston’s District A-1 has “sustained a recent barrage of juvenile incidents within the district involving young teenagers fighting in public, causing disturbances inside businesses, vandalizing storefronts by smashing glass windows with blunt objects, aggravated assaults, assaults on police officers, and civil rights violations.”

It mentions details about a fight involving teens inside the Black Seed Café on Tremont Street last month.

Just two days before that, police say aggressive teens attacked an 81 year old man inside the McDonald’s on Washington Street.

Earlier that same day, investigators allege that a group of juveniles began shouting “Black Lives Matter” inside Silvertone Bar on Bromfield Street after staff there refused to serve them alcohol. Police allege those teenagers spat on an employee and customers before shattering the front door of the establishment.

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What happened to neighborhood watch programs? I bet these 'teens' are walking home along a pretty predictable route after school that takes them through these neighborhoods. Probably wouldn't be very difficult to get local businesses and residents to, I dunno, police their own communities against these hooligans