Officials say the group was at the bottom of a steep slope and triggered an avalanche on Lake Agnes around 3 p.m.
They say the three who weren't caught in the slide called for help on their cellphones and managed to pull one of their companions out.
Parks Canada safety crews took four of the snowshoers away from the site then triggered two more avalanches.
They say once the area was deemed safe, a search dog was brought in to find the remaining snowshoer.
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