(CNN) -- Rangers at Yellowstone National Park are investigating the shooting death of a 3-year-old girl at a campground inside the park.
The mother of the girl told a 911 dispatcher that the girl shot herself with a handgun Saturday morning, according to a statement from the park.
The identity of the girl and her family was not released.
Visitors to the park are legally allowed to carry guns, but "discharging a firearm for any reason is illegal," according to the park.
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