ANCHORAGE, Alaska (AP) -- A 21-year-old woman was attacked by a grizzly bear about 25 yards from an Alaskan lodge.

Abby Sist, of Utah, was attacked late Wednesday as she returned from a hike to the Kenai Princess Lodge in Cooper Landing.

Alaska State Troopers spokeswoman Beth Ipsen says another guest at the lodge saw the bear on top of Sist and ran outside to help. Ipsen says the guest scared the bear off.

Ipsen says Sist was undergoing emergency surgery Thursday morning.

Her condition and hometown were not immediately available.

Cooper Landing is about 50 miles southwest of Anchorage on the Kenai Peninsula.