The North Dakota industrial plant fire that sparked earlier this week, sending fireballs shooting hundreds of feet into the air at one point, has been extinguished.
Most firefighters returned from the Williston facility belonging to Red River Supply late Tuesday, though one truck remained early Wednesday to monitor hot spots, fire department shift captain Steven Kerzmann told The Associated Press.
"The fire is out, but you've got some smoldering embers that might pop up here and there," he said.
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The blaze, which started around midnight Monday, grew so intense that it sent fireballs hundreds of feet into the air. Kerzmann said early Wednesday that the department is not sure what caused the fire.
State records show several flammable chemicals were on the company's property. The company's website says it provides storage, blending, and delivery of drilling fluids, among other things. It did not respond to a request for comment.
At a news conference about 15 hours after the blaze began, Williston Fire Chief Jason Catrambone said officials couldn't identify which specific chemicals had burned at the site.
The North Dakota Department of Health and other agencies are monitoring air quality near the site for any potential threat, according to agency spokesman Tim Wiedrich. Williston Mayor Howard Klug said a hazmat unit monitoring air quality found nothing of concern Tuesday morning.
A large plume of smoke rose above Williston on Tuesday. It prompted the Federal Aviation Administration to issue a six-hour temporary flight restriction that lasted until 2 p.m. for Williston's Sloulin Field International Airport, airport manager Steven Kjergaard said.
Roads were closed Tuesday near the site, including a stretch of State Highway 1804. Local law enforcement officers cordoned off a half-mile area around the site, diverting traffic.
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