An explosion has killed three workers who had been laying a fuel line at a Wyoming oil storage site, an oil company spokesman said.

The blast at about 10 a.m. Monday near Glenrock, in a remote region of eastern Wyoming, sparked a 10-acre fire before it was brought under control, Samson Resources Co. spokesman Dennis Neill said. The fuel line where the blast victims had been working was intended to supply a heater treatment facility that separates oil from water as they're pumped out of the ground.

The workers were employed by a contractor that the Tulsa, Okla.-based Samson had been hired to bring an oil well back into production at the site, Neill said. The well wasn't involved in the explosion and fire, which happened on the Hornbuckle Ranch, about 50 miles northeast of Casper.

Neil declined to name the company that employed the workers. Samson officials were traveling to the area, and state and federal investigators were on the scene, he said.

Neill said local and federal authorities are investigating the explosion, with the cause still unknown Tuesday. Authorities have not named the three workers.

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