Rescuers have recovered six bodies from a dairy farm on the Colorado plains, but authorities didn’t immediately say what led to the deaths.

Rescue crews entered a confined space at the dairy on Wednesday and recovered the bodies, the Southeast Weld Fire Protection District said on Thursday.

Weld County Sheriff’s Office spokeswoman Melissa Chesmore said her agency also responded to an emergency at the dairy.

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“We didn’t find anything criminal in nature,” she said.

“It looks like an accident.”

She didn’t elaborate on the nature of the emergency or say where exactly the bodies were found, referring questions to state occupational safety regulators.

The local Keenesburg Police Department said it was not among the responding agencies.

The dairy is located along a rural road near Keenesburg, about 55km northeast of Denver.