Mysterious disease kills 67 horses in just days at federal facility in Colorado: "What on earth is going on"

An outbreak of an undetermined and highly contagious disease has killed dozens of wild horses at a federal holding facility in southern Colorado.

Bureau of Land Management officials say 67 horses have died since the outbreak began Saturday at the agency's holding pen in Canon City, about 150 miles southwest of Denver.

"We are working with local, state and federal officials to determine what is impacting horses in the facility and how we can respond as effectively as possible," said Stephen Leonard, the manager of the BLM Colorado Wild Horse and Burro Program.