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One of the four workers injured in a “flash fire” at a Wyoming refinery owned by Houston-based EOG Resources has died.

EOG Resources confirmed that a contractor working at the site’s natural gas storage tank when a fire broke out Tuesday succumbed to his injuries.

The victim’s name hasn’t been released.

Two contractors and two EOG employees were taken to the hospital Tuesday after the accident.

One of the workers was treated in an outpatient facility and released. The two other surviving workers remain hospitalized.

The severity of the workers’ injuries haven’t been disclosed.

EOG said one of the two wells at the facility was shut in after the fire.

The blaze broke out Tuesday as two EOG employees and two contractors were cleaning a natural gas storage tank south of La Barge around 2 p.m.

The fire was quickly extinguished by local firefighters.

An EOG spokesman said the incident was a “flash fire” and not an explosion.

The cause of the fire is being investigated.

EOG didn’t disclose the extent of the damage to the facility or if the incident will disrupt operations.

EOG is an independent crude oil and natural gas company with total estimated net proved reserves of approximately 2.1 billion barrels of oil equivalent with U.S. assets accounting for 94 percent of its reserves.