Dallas Fire-Rescue battled a small fire at Lake Highlands High School Monday afternoon.
Investigators said some students and at least one teacher were inside the building when the curtains in the school's freshman center auditorium caught fire around 2:15 p.m. in the 9400 block of Church Road in Dallas.
Some of the faculty tried to extinguish the fire, but it generated quite a bit of smoke in the building.
The fire has been contained, but firefighters are trying to ventilate the building.
There are no reports of any injuries.
The cause of the fire is unknown.