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Associated Press

YELLOWSTONE NATIONAL PARK, Wyo. (AP) - Two employees of Xanterra Parks and Resorts have been injured by bison this month.

The latest attack occurred at about 9 p.m. Friday when a 40-year-old woman from Pittsburgh, Calif., was knocked into a tree in the vicinity of the Old Faithful Lodge Cabins by a bison and then bumped again by the same animal.

The incident occurred near the Columbine Dorm in the area of the Old Faithful Lodge cabins, park officials said.

The woman, whose identity was not released, had back and neck pain and was taken to West Yellowstone.

From there she was flown to Eastern Idaho Regional Medical Center in Idaho Falls for evaluation and treatment.

Before dawn on May 13, a 50-year-old man was walking to the employee dining room near the Old Faithful Inn when he felt the ground shake and was knocked down by a bison.

The bison stepped on the man, and he was bruised by the animal's horns, but he was not gored.

He was flown to Eastern Idaho Regional Medical Center in Idaho Falls, Idaho, and has since returned to work.

Neither person was gored. Because no one saw either incident, it was unknown whether the bison were bulls or cows.

Because bison can weigh as much as 2,000 pounds and sprint up to 30 miles an hour, park officials urge visitors to be especially careful walking in the park after dark.

It is against the law to come within 100 yards of bears or within 25 yards of all other wildlife.

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