DENVER (KDVR) — It's been about 10 weeks since crews were first called to a dairy operation in Weld County to help with a confined space rescue that claimed six lives, and officials have announced the cause of their deaths.

On Aug. 20, crews responded to the Prospect Valley Dairy in Keenesburg and found that a male party had passed out in a confined space after a pipe had burst, but that another person had been able to get out.

On Thursday, the Weld County Coroner's Office announced that all six victims' causes of death will be "the result of hydrogen sulfide gas exposure." The Occupational Safety and Health Administration and the Weld County Sheriff's Office are still investigating the incident. OSHA said previously that it had six months to complete its investigation, at which point de

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