Two girls were playing in the street when a moose charged in their direction, sending them on a chase, Anchorage Police Department spokesman Lt. Dave Parker said.
The girls, ages 11 and 6, ran to a playground and climbed onto what Parker described as a playhouse.
"The moose got tangled up in it and yanked it down," Parker told the Anchorage Daily News.
The younger girl was "severely stomped on the arm and had hoof marks on her back," Parker said. She was taken to the hospital for treatment.
The older girl was hit by the collapsing playground equipment. Her injuries were treated at the scene, and she was sent home.
Department of Fish and Game wildlife biologists have been notified of the incident, Parker said.