Colorado officials say three Afghan prison workers in the United States for training are missing after failing to return from an organized trip.
The guards are part of a group from Afghanistan being trained at the International Correctional Management Training Center in Canon City, which is run by the Colorado Department of Corrections.
Department spokesman Mark Fairbairn says the trio didn't return to a meeting spot in Colorado Springs at the end of the trip on Saturday evening.
He says the three underwent background checks and vetting by the U.S. State Department and the department's primary concern is ensuring their safety. They all have temporary visas.