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An avalanche has struck a snowmobile gathering in Canada's Rocky Mountains, killing at least three people.About 200 snowmobilers were taking part in the event on Boulder Mountain near Revelstoke, British Columbia, when the avalanche hit on Saturday.

Officials say people may still be trapped. Rescue teams with helicopters and search dogs are combing the area. At least 12 people were injured.

Revelstoke's mayor said the rally had not been an authorised event.

"The Canadian Avalanche Center based in Revelstoke has had a warning for the last three weeks expressing extreme caution in the backcountry," Mayor David Raven told CTV News.


A spokesman for the Royal Canadian Mounted Police said: "The area has been shut down to keep people out. They're going to continue on here with trying to remove people off the mountain."