UPDATE (11/1/18 9:10 a.m.):

One person is confirmed dead following Wednesday's explosion. They have not been identified. 

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A highway in northern Wyoming has reopened after an explosion at an oilfield site.

Campbell County Sheriff's officials say the blast happened around 2 p.m. Wednesday.

They say a medical helicopter was headed to the area but they had no information about any injuries.

Wyoming Highway 59 was closed for more than an hour due to the blast and fire, which sent black smoke into the sky.

At least two propane tanks and oil tanks were burning.

The Gillette News-Record reported firefighters were letting the tanks burn down.