Shortly before 4 p.m. Saturday Aug. 30, fire alarms sounded in the Usdan Student Center. “The fire alarm was activated by a vent which apparently emitted smoke into a closet,” Director of Public Safety Ed Callahan wrote in an e-mail. According to a report from the Waltham Fire Department, two fire engines arrived at the scene along with a deputy. Upon arrival, the alarm was sounding but “nothing was showing.” The report confirmed that an alarm was set off by smoke in a utility closet. The report cited “smoke from cooking” as ...