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COVINGTON, Tenn. (AP) — Arson investigators are working to find the cause of a gas station explosion in western Tennessee.

Covington Fire Chief Michael Naifeh said in a news release that a heavy fire broke out at a gas station in Mason at about 2:45 a.m. Friday.

Multiple volunteer fire departments helped suppress the fire. Naifeh says the fire caused the building to become unstable, with damage to walls and support structures.

No injuries were reported.

The Tennessee Bureau of Investigation’s Bomb and Arson Division and the Bureau of Alcohol, Tobacco and Firearms have been called in to help Covington Fire Department investigators on the scene.

ATF spokesman Michael Knight says the bureau is trying to determine the origin and cause of the blast.