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New details are emerging about a grizzly bear attack in Canada, which authorities now say left three students and one teacher injured

The school group was "having lunch on a trail" when the attack occurred on Nov. 20, authorities said in an update

The bear involved in the attack has not been located

New details are being revealed about the grizzly bear attack involving a group of teachers and students in Canada.

At 1:46 p.m. local time on Thursday, Nov. 20, the BC Emergency Health Services received a call about an "animal attack" on a trail near Highway 20 in Bella Coola on British Columbia’s Central Coast, the Provincial Health Services Authority confirmed to PEOPLE in a statement.

"The victims were part of a school group of students and teachers having lunch along a

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