GARDEN GROVE ( — Authorities say a firefighter sustained minor injuries Sunday while battling a “suspicious” blaze at an Orange County high school.

A public information officer for Metro Net says firefighters were dispatched to Bolsa Grande High School at 1:15 p.m. for the three-alarm fire.

READ MORE: Armed Suspects Posing As Police Follow Residents Home In Violent Robbery

In all, the fire gutted two classrooms and caused smoke and water damage to six others, authorities said.

The PIO said the injured firefighter was transported to a hospital for treatment of minor burns to his hands and feet. He was expected to be released Sunday night.

The cause of the blaze was not known, but firefighters are calling it suspicious in nature. Arson investigators were sent to evaluate the scene.

READ MORE: UCLA Basketball Game At Washington Canceled Due To COVID In Husky Program

While classes weren’t in session, given it was a Sunday, a Vietnamese school uses the campus that day and there was a basketball tournament going on at the time of the blaze, Garden Grove Fire Dept. Division Chief Jeff Spargur said.

Officials told CBS2/KCAL9’s Christy Fajardo that some of the classrooms in that wing were left unopened for the Vietnamese school, which was not using the classroom where the fire started.

“They’re probably going to close the whole wing but, I believe that, after talking to the school district, that the school will be open tomorrow, Spargur said.

MORE NEWS: Local Christmas Tree Lots May Sell Out Early This Year Due To Nationwide Shortage

Students who normally attend classes in that wing of the school will have their lessons relocated Monday to the cafeteria or library.