A grizzly bear attacked a group of schoolchildren and teachers from Acwsalcta School during a hiking trip near Bella Coola, injuring eleven people including severely wounding four.The Royal Canadian Mounted Police and local officers responded quickly while armed officers protected the community as the bear remained at large.The Nuxalk Nation and local authorities urged residents to stay indoors and avoid nearby trails, while the school closed to offer counseling to students and staff.