BOONVILLE, N.Y. (AP) — A fiery explosion ripped through a church in upstate New York on Tuesday, injuring five people including a firefighter who was badly burned while responded to reports of a gas odor in the building, officials said.

New York State Police were investigating the cause of the blast, which occurred around 10:30 a.m. at the Abundant Life Fellowship Church in a rural area about 50 miles (80 kilometers) northeast of Syracuse.

Police said there was no initial indication of criminal activity related to the explosion, which sent thick plumes of black smoke into the air and severely damaged the church.

The church was reportedly heated by propane cylinders, according to state troopers.