Authorities say two businessmen have died after apparently falling into a septic tank in Northeast Wyoming.

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Crook County Sheriff, Steve Stahla, tells KBFS radio in South Dakota, that the bodies of 49-year-old, Matt Driskill, of Devils Tower, and 60-year old, Chuck Hanes, of Belle Fourche,  South Dakota, were pulled from the septic tank at the Devils Tower KOA campground late Wednesday afternoon.

Driskill was the owner of the KOA. Hanes was owner of Tri-State-Septic Service in Belle Fourche.

Stahla says the deaths appear to be a tragic accident, but autopsies will be done to determine an exact cause of death for each.

The campground is located just outside the gate of Devils Tower National Monument.

OSHA is also launching its own investigation.

Services are pending for both men.