What was to be a short afternoon field trip for about 20 students and staff of a school in Bella Coola, B.C., became a scene of trauma and heroism when a grizzly bear attacked without cause, badly injuring four people, the Nuxalk Nation's elected chief said on Friday.

Thursday's attack on the elementary class as they had lunch by a river triggered an outpouring of sympathy for the victims, surprise from experts at the bear's behaviour, and praise for the teachers who drove it off.

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