Updated

Three workers injured in a fire at a Sinclair refinery Wyoming were taken to a burn center in Colorado in critical condition.

Sinclair Oil Corp. says the flash fire happened Tuesday inside a gas recovery unit at its refinery about five miles east of Rawlins.

The Rawlins Daily Times reports (http://bit.ly/IIph6z ) Tim Bjork, Eric Hansen and another unidentified worker were critically hurt and being treated at a burn center in Greeley, Colo. A fourth worker was treated and released from a Rawlins hospital.

The state Occupational Safety and Health Administration is investigating, but an agency spokeswoman said Wednesday it has no information to release.

Salt Lake City-based Sinclair has released little information but says there appears to be little or no damage to the facility.