New Delhi, Aug. 23 -- An apparent accident at a dairy in a rural farming community in Colorado involving exposure to gas killed six people, including a high school student, authorities said Thursday.

Investigators are looking into what kind of gases may have played a role in the deaths Wednesday at Prospect Valley Dairy in Keenesburg, about 35 miles (55 kilometers) northeast of Denver. Crews recovered the bodies in a confined space at the dairy, the Southeast Weld Fire Protection District said.

"We are investigating these deaths as the possible consequence of gas exposure in a confined space," said Jolene Weiner, chief deputy coroner for Weld County.

The identities of those who died, all Hispanic males, were being withheld pending noti...