It happened Sunday morning at the Victorian Arms apartments on the 1300 block of Darby Road in Havertown.
Firefighters arrived after getting a call that a resident was showing signs of carbon monoxide poisoning.
Crews discovered elevated levels of carbon monoxide and ordered everyone out of the building.
The residents are staying at the fire house, less than a block from the apartments, while PECO crews look for the source of the problem.
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