Three mountaineers presumed dead in Canada avalanche

Three world-renowned professional mountaineers -- two Austrians and an American -- were missing and presumed dead after an avalanche on a western Canadian summit, the country's national parks agency said Thursday. American Jess Roskelley, 36, and Austrians Hansjorg Auer, 35, and David Lama, 28, went missing Tuesday evening in Banff National Park, according to media reports.

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