A grizzly bear attacked a group of schoolchildren and teachers from Acwsalcta School, operated by the Nuxalk First Nation, near Bella Coola, British Columbia.Eleven people were injured, including four who required hospital transport, with two in critical condition and two in serious condition.Local authorities warned residents to avoid the forest and highways, while the school closed to provide counseling and the Nuxalk Nation urged people to stay indoors due to the aggressive bear at large.