Authorities say a man who was killed after a rupture at a natural gas well in northern Colorado was from Wyoming.

Weld County coroner’s officials identified the victim Thursday as 60-year-old Brian Wallace, of Evanston, Wyo. They say he died immediately from blunt force injuries after the explosion Wednesday at a well operated by Encana Corp. north of Fort Lupton.

Wallace worked for BGH Gas Testing Operations Inc., which provides well services to the site.

Three other people suffered relatively minor injuries in the explosion.

Sheriff’s Sgt. Tim Schwartz says pressure apparently caused one or more pieces of equipment to break loose.

Encana says the well is shut down while investigators try to determine what caused the accident.