Fairfax County firefighters were called to a high school in Dunn Loring after a flash fire broke out Saturday morning.
Investigators say that the fire at George C. Marshall High School happened shortly before 10:30 a.m. The fire was brought under control within 10 minutes of first responders arriving. Five contractors working in the school were treated at the scene for smoke inhalation, but not transported to hospital.
The cause of the fire has not yet been determined. Officials say that fire alarms in the school were activated, but the school's sprinkler system was not because the blaze was a flash fire.
Damage is estimated at $20,000.