Barton County officials say a man and his son-in-law died in an oilfield-related accident.

Sheriff Brian Bellendir says the men died Monday about one mile northeast of Claflin. The victims, 50-year-old Curtis Hoffman and 30-year-old Kebby Myers, apparently died after being overcome by hydrogen sulfide gas.

Preliminary reports indicate Hoffman was working on a valve and called Myers to bring some parts. Hoffman apparently was overcome by the gas and Myers was also overcome when he arrived with the parts.

Family members went to check on the men when they didn’t arrive home.

Hydrogen sulfide gas is a byproduct of the production of oil and natural gas. A hazardous materials crew was called in to clean up.

The accident is under investigation.

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Associated Press Information from: KWCH-TV