Authorities are unable to say what caused a large industrial fire in Williston to ignite, reports The Associated Press.
Williston Fire Chief Jason Catrambone said at a news conference Tuesday that officials can’t identify which specific chemicals had burned at Red River Supply.
Williams County Emergency Manager Mike Hallesy said it’s not clear what particulates were in a large plume of smoke, but that the cloud did not blow toward the city.
The North Dakota Department of Health was monitoring air quality. Hallesy also said an Environmental Protection Agency official is coming to town.
State hazardous-chemical records show several flammable chemicals were on the company’s property.
Catrambone said firefighters are letting the fire burn. And Hallesy said the fire was “pretty well contained,” though flare-ups likely will continue.