Searchers looking for a six-year-old boy who went missing in mountainous terrain in Alberta a week ago say the likelihood he's still alive is less than five per cent, but they say the search has not been scaled back.

However, Adam Kennedy with Alberta Search and Rescue says tactics will change given the low probability Darius Macdougall is still alive, such as focusing less on using heat-seeking aerial cameras.

Kennedy says searchers will also place more weight on the possibility the boy might not be physically able to respond to people calling out for him.

The search had already been using tactics geared for the possibility Darius might not respond, since he has autism.

Darius was last seen Sept. 21 while walking with young family members in the Crowsnest Pass area, where the family h

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