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WELD COUNTY, Colo. — One person was killed and two others were injured after an accident at a hydraulic fracturing site in Weld County on Thursday morning. The Weld County Sheriff’s Office said the incident happened about 9:30 a.m. at a rig site off Weld County Road 9 1/2 just north of Colorado  66 near the town of Mead. The accident was caused by a high-pressure water valve that ruptured or exploded, the sheriff’s office said. Water rushed out at an estimated pressure of 3,000 to 4,500 psi, officials said. A Flight for Life was on the ground to transport the surviving victims to a hospital. The site is operated by Halliburton, and all three victims worked for the company. The injured men were identified as Thomas Sedlmayr, 48; and Grant Casey, 28. The deceased victim’s name was withheld. “Halliburton is saddened to confirm the death of our employee who died on a work site north of Fort Lupton, Colo.,” the company said in a statement. “This is a very difficult time for all of us at Halliburton, and we are working with local authorities as they look into the details of this incident.  Our thoughts and prayers are with our employees’ loved ones. Out of respect for the families’ privacy, we are not releasing any additional information at this time.”