Helicopters hum across a bright blue sky in southern Alberta, as the search for five-year-old Darius Macdougall stretches into its fourth day.

Adam Kennedy with Search and Rescue Alberta said Wednesday afternoon it is expanding the search radius from three kilometres to 6.6 kilometres.

The terrain, he said, is part of the challenge.

"Anytime we have technical terrain like this, it definitely slows people down from a safety aspect," said Kennedy. "Just the amount of deadfall on the ground; the amount of rocks in the area."

Approximately 100 people are part of the search and rescue efforts on the ground.

Nearly 100 searchers scouring forested Alberta area for missing 5-year-old

After consulting two wilderness survivability physicians, Kennedy said the team was hopeful and is continuing

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