Fire crews were on the scene of a suspicious blaze inside a house in Philadelphia's Torresdale section early Friday morning.
The fire broke out just before 2:30 a.m. on the 8600 block of Rose Lane.
Firefighters arrived to find smoke throughout the house and the area.
They also discovered a liquid accelerant near the scene of the fire.
There were no reports of injuries.
The fire marshal arrived to investigate the blaze.
Police are treating the area as a crime scene.