The final report is in and investigators say they have found no evidence that the deadly fire at a West Chester senior living center was intentionally set.
The ATF said the cause of the 5-alarm blaze is "undetermined."
Four people were killed when fire swept through the Barclay Friends Senior Living Community in November 2017.
Investigators believe the fire started on a rear patio.
Lack of outdoor sprinklers, which is not required by code, and excessive winds fueled the flames.
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