Police are searching for Sandy teen Jade Thornberg, who has been missing since July 31.
Thornberg, 16, was last seen at her house that day, and told her sister she was leaving to go to a friend's house.
Thornberg has run away before, but police said she has always contacted her mother to let her know she was OK. This time her cellphone is disconnected, which raises an alarm, said Sandy police Sgt. Jon Arnold.