Residence Hall/Dormitory, Residential Boston, MA – Sprinkler system activated on third floor dormitory fire at Boston University September 4, 2018 viking210 A fire in a Boston University dormitory on move-in weekend has forced the evacuation of about 40 students. Boston fire officials say the fire broke out at about 10 p.m. Saturday night and was contained to one room on the third floor of the building on Commonwealth Avenue. The fire set off the sprinkler system in the building and led to water and smoke damage on the first three floors. Fire officials say one student was treated for a minor burn to her leg. It was not clear Sunday morning when students would be allowed to return to their rooms. The school says its residence life staff is working with the displaced students to find them places to stay. Fire officials were investigating to determine how the fire started.