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An electrical vault explosion caused a steel manhole cover to “dislodge” and fall onto two cars, leaving three people injured in Northridge on Friday, authorities said.

Three cars were involved in a crash related to the explosion, and power was temporarily lost at Cal State Northridge, which planned to hold its graduation ceremony Friday evening.

A utility power systems crew was responding, according to a news release from the Los Angeles Department of Water and Power.

The explosion occurred at Nordhoff Street and Reseda Boulevard (map), DWP stated.

“Initial reports from first responders on scene indicate that three to four cars were involved in an accident related to the blast and that the steel vault cover fell onto one car and injured one of the occupants,” the DWP release said.

The manhole cover struck one vehicle and landed on another, the Los Angeles Fire Department stated on Twitter. Three people were taken to a hospital with minor injuries, the Fire Department said.

Three cars were involved in the collision, stated LAFD, which was called to the scene at 1:19 p.m.

CSUN announced that campus power had been restored about 3:20 p.m. and that graduation would go on as planned.