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DURANGO, COLO. (AP) -- Authorities looking for a 13-year-old boy missing for more than a week in southwestern Colorado don't believe he ran away.

La Plata County sheriff's spokesman Dan Bender said Wednesday that investigators are no longer looking at the possibility that Dylan Redwine ran away while visiting his father for Thanksgiving break. In a statement, Bender also said that investigators still view their operation as a search, not a recovery mission, but he didn't elaborate on why.

The boy's mother, Elaine Redwine, told ABC News she thinks her ex-husband, Mark Redwine, may be involved in her son's disappearance.

The Durango Herald reported that Mark Redwine attended a vigil for his son on Tuesday night. He said he wished his ex-wife could come together at such a difficult time.

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