Around 10:45 p.m. at Brighton Avenue and Cambridge Street. Fortunately for the injured, there's a firehouse right there. Boston EMS Incidents reports one of the injured appeared "unresponsive" when EMTs arrived; he was rushed to Beth Israel Hospital, rather than taken to the nearby St. Elizabeth.
A nearby resident reports she saw it all:
It felt so high school. A bunch of 30-somethings yelling at each other. Then punches pretty quickly. One white dude was who the van of guys were trying to get at.