The search for a missing six-year-old boy in southern Alberta has been called off, RCMP said Wednesday.

Darius Macdougall, who has autism, was reported missing Sept. 21 after he didn't return from a walk with six young relatives in the Crowsnest Pass area, where the family from Lethbridge, Alta., had been camping.

Searchers, helicopters, dogs, drones and underwater teams have scoured 22 square kilometres of the woods since the boy disappeared, but nothing found in the search has been linked to him, RCMP said. Searchers have described the area as mountainous, with lots of elevation changes, streams and deadfall.

"The scene will be demobilized," said RCMP Cpl. Gina Slaney. "That being said the investigation will carry on until Darius is found."

Slaney said the area that has been the focu

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