Two men were shot, one in the head, around 9:40 p.m. behind 277 Centre St., midway between the T stop and Bickford Street.
Both were taken to local hospitals, where they died. Boston Police report one victim was in his 20s and that the other is believed to be in his 50s.
Police officers were called in from across the city for crowd control. Centre Street was shut.
These are Boston's 17th and 18th murders in 2018.