CHEYENNE, Wyo. (AP) — Wyoming has issued 19 citations for an explosion that killed three workers near an oil well last year.

Workplace safety officials say they mailed the citations Thursday but won't release additional details until the recipients confirm they received the documents.

The explosion and fire happened Aug. 29 about 40 miles northeast of Casper at an oil well site owned by Tulsa, Okla.-based Samson Resources. The blast killed James Turner, Llewellyn Dort and Gerardo Alatorre. The three workers were installing pipe.

Turner worked for Double D Welding and Fabrication in Mills. A woman at the company declined to comment Monday. Dort and Alatorre worked for Wild West Construction, a Glenrock company without a listed phone number.

Samson officials did not immediately return a phone message.

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