COLUMBIA FALLS, Mont. (From news reports) -- Emergency crews have cleared the scene at Weyerhaeuser in Columbia Falls after an explosion started a fire at the facility Saturday morning, April 4.

Columbia Falls Fire Chief Karl Weeks said the department was dispatched to the MDF plant on Mills Drive at 6:40 a.m. due to an explosion.

Heavy smoke was coming out of the west side of the building, according to Weeks.

Several agencies were called in to help including Whitefish, Bad Rock, Evergreen, and Three Rivers.

No injuries were reported in the explosion, which is still under investigation. A cause has not yet been determined.

Fire crews cleared the scene at 2:46 p.m. Saturday. Cleanup was turned over to Weyerhaeuser.