OKLAHOMA CITY - A vacant high school caught on fire early Thursday near Spencer, firefighters said.

The fire was reported shortly after 3:45 a.m. in the 4300 block of Adair Street.

The fire was initially called in as a grass fire but fire officials think the fire started in the school before spreading.

The building was fully involved but firefighters were able to contain the fire.

Stay with News 9 and News9.com for more information as it becomes available.