UPPER CHICHESTER, Pa. (WPVI) -- Fire ripped through a house in Upper Chichester, Delaware County Thursday morning.
It broke out before 6:30 a.m. at a home in the unit block of Winding Way.
Firefighters arrived to find heavy smoke coming from the second floor.
Officials say a floor collapsed before crews were able to get the upper hand.
Everyone inside the house was able to make it out safely. They were awakened by smoke alarms.
No injuries were reported.
The fire marshal says an electrical problem may have sparked the blaze.