A stubborn fire was apparently started by construction workers at Columbine High School in Jefferson County Wednesday.
Littleton Fire Department got the first call at 5:40 p.m. and the first engine to respond reported light smoke showing on the side facing the street. A second alarm was sounded about 6:10 p.m. because of smoke reported in the building.
The blaze was extinguished about 45 minutes after it started, but not before creating a large amount of black smoke.
The fire was believed to have been caused by contractors who were welding on the roof of the school, catching insulation in a wall on fire.
The two-alarm response brought out 10 engines, two aerial trucks, four fire chiefs and four medical units. Mutual aid came from South Metro, Englewood and West Metro fire departments.
There were no injuries from the fire and no damage estimate was available Wednesday night.