EAGLE COUNTY, Colo. (CBS4)– The search for a 3-year-old missing boy has expanded but unfortunately there are no new clues. Sebastian Castro disappeared last Friday from Eagle County.

(credit: Eagle)

On Tuesday, a dog team joined the search for the little boy. The search area was expanded along the Eagle River to Hanging Lake but turned up nothing new.

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An article of clothing was spotted along the river on Sunday along with the phone he was carrying.

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His family says he responds to children’s songs, animal noise and colorful items. They add he may not be comfortable with adults he does not know. Sebastian has autism.

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(credit: Eagle)

Volunteers have been asked to sign up online before helping crews.