LOS ANGELES—Nearly 100 firefighters have extinguished a fire that gutted a shop building at a Los Angeles high school.

Flames were licking through the roof when 94 city firefighters arrived just before 3 a.m. Friday at James Monroe High School in the San Fernando Valley. The blaze was put out in 45 minutes.

The fire was in a freestanding building and there was no damage to other structures.

There are no injuries.

KNX radio says arson investigators are now working to determine the cause of the blaze.

Classes will be held Friday as scheduled on the North Hills campus.

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Information from: KNX-AM, http://www.knx1070.com/