A vacant two-story row home collapsed in the Ogontz section of Philadelphia on Sunday evening landing two people in the hospital.
Those two people were walking by the building when it suddenly caved in. They were injured and were transported to Einstein Hospital.
"The building just came down and smoke everywhere," said witness Mike Scott who helped one of the victims.
City records show the property, located at Limekiln Pike and Ogontz Avenue, has a history of violations related to garbage and extermination, but no history of violations related to its structure.
Inspectors with the Department of Licenses and Inspections are expected on the scene Monday as they work to determine an exact cause for the collapse.
Firefighters have suspicions about the cause.
"The middle of the building is sagging. It could have been from the weather or change in temperature. I just don't know," said fire department Cpt. Clifford Gilliam.
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The collapse occurred just before 8 p.m. Both victims are in stable condition and will be fine, according to fire officials.