BERKELEY -- At least one person was hospitalized and a mandatory evacuation was ordered at the University of California at Berkeley Monday after an explosion followed a power outage across campus.
Fire crews were also trying to free about 20 people trapped in dormitory elevators across campus as a result of the outage, said UC Berkeley spokesman Dan Mogulof.
The power outage was reported around 4:30 p.m. Monday and led to classes being cancelled as students were told to suspend all lab activities, Mogulof said.
About a half-hour later, authorities reported an apparent ammonia leak in a room at Latimer Hall.
That was followed by an explosion near California Hall shortly before 7 p.m., Berkeley acting fire Chief Gil Dong said.
The explosion sent at least one person to a local hospital with non-life threatening injuries and a few others received minor injuries and refused treatment at the scene, Mogulof said.
The blast may have been caused by an attempted underground copper wire theft on campus last week, Mogulof said.
"It appears that may have caused far greater damage than initially thought," Mogulof said.
But officials said the cause of the other incidents, and whether any or all of them were related, had not immediately been determined.