A 3-year-old girl shot and killed herself at Yellowstone National Park on Saturday, according to a park spokesman.
The girl's mother told a 911 dispatcher that her daughter shot herself with a handgun, said park spokesman Al Nash.
The Associated Press reported it was the park's first gun death since 1978.
The incident occurred Saturday morning in the Grant Village Campground, Nash said. Emergency personnel rushed to the scene in attempts to save her, but ultimately failed. Part of the campground remains closed while the investigation is ongoing.
It was unclear how the child obtained the gun. Nash did not comment on the details of the investigation.
He did say National Park Service Rangers and National Park Service special agents are investigating the case. A federal district court and magistrate oversee criminal court matters in the park.
The girl was from Idaho. Her name was withheld at the request of the family.
The shooting happened four years after Congress approved the possession of handguns in National Parks and federal wildlife areas. The law, which was attached as an amendment to a credit card bill, allows concealed weapons in parks provided they are allowed by state law.