The STEM Academy in Downingtown is closed Monday, April 23, 2018.
School officials expect students will be able to return to class on Tuesday.
They say teachers will interact with students online throughout the day.
Firefighters were called to the school at 335 Manor Avenue around 8:30 p.m. Sunday.
Crews found a small fire in a chemistry lab and quickly got it under control.
There is no word on what sparked the fire.
Fire closes high school in Downingtown
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