Three workers at the Sinclair refinery near Rawlins have been flown to a burn center in Colorado following a flash fire.

Sinclair Oil Corp. says the incident happened inside a gas recovery unit at its refinery, about five miles east of Rawlins, about 10:20 a.m. Tuesday.

Sinclair Police Chief Jeff Sanders says it was a flash fire and four workers were originally taken to Memorial Hospital of Carbon County.

A Memorial Hospital spokeswoman says three of the workers were flown to a burn center in Greeley, Colo., while the fourth was treated and released. No details on the injuries of the hospitalized workers were immediately available.

Salt Lake City-based Sinclair says there appeared to be little or no damage to the facility.

It says it is investigating the incident.

The refinery has been in operation since 1923.  According to the company’s website, the plant has the capability of processing about 80,000 barrels of crude oil a day.