A grizzly bear attacked a group of elementary schoolchildren and their teachers on a walking trail Thursday in British Columbia, injuring 11 people, including two critically, officials said.

The attack happened early Thursday afternoon near the town of Bella Coola along British Columbia’s Central Coast. The Nuxalk Nation said the “aggressive bear” remained at large Thursday evening and urged residents to stay indoors while police and conservation officers searched the area.

A family member of one of the victims was working at a gift shop across the street from the Acwsalcta School, an independent school run by the Nuxalk Nation, where the children left for their walk. She tells KIRO Newsradio she watched many of the children walking back to the school right after the attack.

“They were

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