Fire crews were called to an abandoned house fire in the 400 block of Sloan Street in Pittsburgh's Esplen, at about 3:30 a.m. Wednesday.
Crews reported heavy flames coming from all stories of the abandoned structure.
A 54-year-old firefighter was transported to UPMC Mercy Hospital after complaining of dizziness.
Arson investigators were called to the scene, the fire was said to be under control at about 4 a.m. but was still working.
So far, there's no word on what may have caused the fire.
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