Firefighters battled a blaze at the Cimarron Apartments in Broken Arrow late Thursday night.
The complex, at 31st Street and 129th East Avenue, caught fire before 9:30 p.m.
Two units were severely burned, and six more units have smoke damage, according to firefighters on scene. They said wind was a factor as they were battling the fire.
The fire marshal will determine the cause.
No injuries were reported. The Tulsa Area Red Cross says they are assisting six families with food and lodging following the fire.