A grizzly bear attacked schoolchildren and teachers from Acwsalcta School in Bella Coola, Canada, injuring eleven people during a hiking trip.Four victims were seriously hurt, including three children and one adult teacher, and the male teacher who bore the brunt of the attack was airlifted to hospital.The Royal Canadian Mounted Police and Conservation Officers warned the community to avoid the area while armed officers searched for the bear, which remained at large after the incident.