Some ComEd equipment apparently caught fire.
It's unclear what sparked this fire or if anyone is hurt. Heavy, black smoke could be seen rising from the fire.
A still-and-box alarm and Level I HazMat alarm were called as a precaution just after 7 a.m., Fire Media Affairs spokesman Rich Rosado said.
Unconfirmed dispatch reports said the fire started in a transformer in an electrical plant complex.
