Firefighters responded to the school on the 800 block of North Broad Street just before 9 p.m. Tuesday.
There is no word on the origin of the fire or the extent of the damage to the building.
In addition to classes being canceled, all after-school activities including all athletic programs and professional development sessions scheduled for Wednesday are canceled as well.
For further information, families are urged to check the School District of Philadelphia's website.
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