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Authorities identified a possible cause of death after six died while working at a Colorado dairy farm in August

After conducting toxicology tests and autopsies, the Weld County coroner's office determined that the victims had been exposed to hydrogen sulfide gas; an investigation into the deaths is still ongoing

The dead included Alejandro Espinoza Cruz and his sons Oscar Espinoza Leos, 17, and Carlos Espinoza Prado, 29, as well as one of their relatives by marriage

A possible cause of death has been revealed after six people — including a father and his two young sons — died while working at a Colorado dairy farm in August.

On Thursday, Oct. 30, the Associated Press reported that the individuals were exposed to hydrogen sulfide gas while working at Prospect Valley Dai

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