Police are calling a fire that damaged a church in Massachusetts early Tuesday morning suspicious.
The fire broke out around 3:30 a.m. at the Riverside Church on Groveland Street in Haverhill.
The ATF has now joined the investigation and the FBI is helping, as well.
The church's pastor thinks it was intentionally set. He told the Eagle-Tribune that investigators found an accelerant poured along the side of the building.
Firefighters managed to put out the fire, but it damaged a wall of the building.