Story highlights

The fire on a back lot is nearly contained

No injuries are reported

The building that caught fire is under demolition

(CNN) —  

A fire at Universal Studios sent heavy smoke into the air on Thursday afternoon, according to officials in Los Angeles County.

About 55 firefighters responded and the fire in a three-story building on the back lot was nearly knocked down by about 1 p.m. PT, said Inspector Quvondo Johnson of the Los Angeles County Fire Department.

There were no reports of injuries from the fire, which was reported about noon.

The cause of the fire was unknown, but the building was under demolition, Johnson said.