Investigators are trying to find out how a classroom at Clovis West High School caught fire.
It sparked just before 7:30 p.m. Wednesday in the photography room.
The smoke swirled around the arts building, but firefighters put it out.
Thankfully, the only kids nearby were practicing sports across the street.
Investigators say a janitor breathed in smoke, but was looked at by a doctor, and is okay.