An overnight fire at Grover Cleveland STEM High School in South Seattle caused an estimated $4,000 in damage, officials said.
Firefighters responded to the scene, on 15th Avenue near Boeing Field, at about 2:35 a.m. after receiving an alarm.
Crews knocked down the flames quickly. Officials at the scene said sprinklers in the building helped contain the fire to an athletic training room and limit its spread.
No injuries were reported.
An investigation found that the fire was accidental and involved an overheated appliance that ignited nearby combustibles.