It happened around 2:30 a.m. Sunday at the Forrest Creek Apartments on the 300 block of North Front Street.
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Residents of one building heard an explosion and noticed smoke.
Firefighters quickly arrived and ripped open part of the roof, searching for flames. They found only smoke.
Investigators say a transformer box mounted on the front of building D shorted out, causing the fire.
Crews evacuated the building and cut off power to the complex's other buildings.
The Red Cross says 84 apartments have been evacuated.
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Many residents sat in their vehicles or stood outside, huddled under blankets, until SEPTA buses came to take them to Yeadon Borough Hall.
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