The teenage outdoor education students, having progressed to the point of being on their own in the vast Alaska wilderness, were lined up single file for a river crossing when the grizzly burst with fury into the front of the line, badly mauling two in the group and injuring two more.

Those in the front screamed of the bear’s presence. The bear was with her cub when she attacked, according to state troopers.

The teens were in a group of seven participating in a 30-day backcountry course conducted by the National Outdoor Leadership School when the attack occurred Saturday night in the Talkeetna Mountains north of Anchorage. They were rescued early Sunday after activating their emergency locator beacon and tending to their most seriously wounded