Power was restored to most of the University of California, Berkeley, Tuesday after an explosion left one person hospitalized for minor burns, campus officials said. The school’s Twitter feed announced early Tuesday that most classes would meet as scheduled. Eleven buildings remained without power and classes in those buildings were canceled. The explosion occurred in an underground utility vault before 7 p.m. California time Monday as crews were trying to restore power following an outage. In addition to the one person hospitalized, three others also received minor burns but refused treatment, according to UC Berkeley spokesman Dan Mogulof.