Can we draw the following hypothesis from the context? 

Context:

WEST CHESTER, Pa. (AP) — A massive fire has ripped through a senior living community in Pennsylvania. The blaze was reported around 11 p.m. Thursday at Barclay Friends Senior Living Community in West Chester, about 35 miles west of Philadelphia. The fire quickly spread to multiple buildings, forcing residents outside into the cold. Emergency crews transported people from the scene. There was no immediate word on any injuries. Advertisement It's unclear what sparked the fire.

Hypothesis: There were several workers inside when the fire happened
It's impossible to say