Williston fire

Associated Press
A fire burns at Red River Supply in an industrial part of Williston, N.D., in the early hours of Tuesday, July 22, 2014. The site is near three oil companies and a rail line, just east of Williston's downtown. Explosions could be seen and heard at the scene, but it wasn't immediately clear what caught on fire. No injuries were immediately reported. Red River Supply provides services to oil companies working in North Dakota's oil patch. (AP Photo/Josh Wood)

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A massive fire was still burning Tuesday afternoon 12 hours after it began at an oil supply company in an industrial part of the western North Dakota oil patch town of Williston.

Department of Health Air Quality Division director Terry O'Clair said local fire departments are letting the blaze at Red River Supply burn itself out and a National Guard hazmat unit is heading to the scene.

It wasn't immediately clear what caused the fire, which started about midnight Monday, and state officials said Tuesday there were no injuries. Red River Supply officials did not immediately respond to requests for comment, and law enforcement will not let anyone past the half-mile evacuation border. (AP)

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