OKLAHOMA CITY -- Fire crews responded to a smoke investigation call about 10 p.m. in the 9000 block of North University Avenue.
The building is the site of the old John Marshall High School.
When crews arrived there was visible smoke coming from the building.
Once inside, firefighters found a mattress and a couch on fire.
Crews went it suited up with Hazardous Materials protection, including respirators.
The building is vacant.
No injuries reported.