Dylan Redwine has been missing since Monday.

DURANGO, Colo. (AP) -- Volunteers in southwestern Colorado spent part of their Thanksgiving searching for a 13-year-old boy who went missing while visiting his father.

Sixty people looked for Dylan Redwine around Vallecito Reservoir and Forest Lakes on Thursday. They also passed out fliers and knocked on doors seeking clues about his whereabouts.

The Durango Herald reports that a Vallecito resident saw Dylan walking along a road there with another boy on Monday afternoon. Both had backpacks.

Authorities suspect Dylan may have run away, but La Plata County Sheriff's Office spokesman Dan Bender said they haven't ruled out the possibility that he was abducted.

Dylan lives with his mother in Colorado Springs but a judge issued his father visitation rights for Thanksgiving.