HOULTON, Maine — Firefighters from two towns spent two hours extinguishing a fire at Steelstone Industries after an explosion rocked the plant early Tuesday.

There were no injuries when a tank containing fuel and tar exploded, Houlton Fire Department officials said.

The incident happened just before 10 a.m., and 12 firefighters spent two hours at the business extinguishing the blaze, which was mostly suppressed with foam.

Located on Smyrna Street, Steelstone operates a concrete batch plant, a crushed stone sand and gravel mine, and a hot mix asphalt plant.

The Department of Environmental Protection was called to the scene shortly after the fire was extinguished.

The Houlton Fire Department received mutual aid from the Hodgdon Fire Department.