An investigation has been launched after an accident at an Encana Corp. natural gas drilling site in Colorado killed one person and injured three others. According to law enforcement officials, a high-pressure gas release occurred when four contractors with BGH Gas Test Operating Inc. of Castle Rock, CO, were ramping up production at the well, which is in the Niobrara formation. No explosion or fire occurred at the drilling site, which is near the town of Platteville, about 30 miles north of Denver. Encana has launched an internal investigation; state officials also are conducting an investigation.

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