A Cleveland, Tenn., teenager has disappeared while out for a run in Colorado.
Joseph Keller, 19, has been missing since July 23 in Conejos County.
The Bradley County Sheriff's Office offered to send a special response team and other resources to help Colorado authorities in their search, but the offer was declined, according to a news release.
Bradley County investigators have sought and received the help of the Federal Bureau of Investigation, the release stated.