Searchers are hoping the lilt of a familiar song will draw a six-year-old boy out of the woods after he vanished from a southern Alberta campground Sunday.

Adam Kennedy from Alberta Search and Rescue says crews are employing several tactics in looking for Darius Macdougall, who has autism.

They include avoiding loud noises or bright lights at night.

“The priorities remain pushing further out routes that Darius may have travelled on while continuing to cover areas previously searched,” Kennedy told reporters Thursday.

Ground crews spent the night scouring the area, with support from drones, helicopters and police dogs, he said.

“There are approximately 120 personnel on the scene from across Alberta and British Columbia continuing the ground search,” he said.

RCMP Cpl. Gina Slaney said

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