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A large area of the park near the Midway Geyser Basin was temporarily closed pending an investigation. The area includes at least five trails and several backcountry campsites.

Park officials said one or more bears were involved, but did not specify which species. The park has populations of both grizzly bears and black bears, which can be difficult to tell apart at times. Grizzlies can be more aggressive and they grow much larger — as much as twice as big as black bears. Black bears usually have darker coloring.

Further information — including whether the victims were hiking together and whether they were hospitalized for their injuries — was not being immediately released, said Yellowstone spokesperson Ashton Hooker.

Yellowstone gets more than 4 million visits by tourists annually and attacks by grizzlies or black bears are rare.

In September, a hiker suffered injuries to his chest and arm in northeast of Yellowstone Lake, and a grizzly just west of Yellowstone in 2023. The last fatal bear mauling in the park was in 2015 when a 63-year-old Billings, Montana man was killed while in the park's Lake Village area.

The fate of bears that attack humans is typically dictated by the circumstances of the encounter.

Following the 2015 fatal attack, officials captured and killed an adult female grizzly because it had eaten part of the victim's body and hid the rest, which is not normal behavior for a bear defending its young.

By comparison, last year's attack on the Turbid Lake Trail happened during a surprise encounter between the victim and the bear. The animal's reaction was considered natural, so it was not relocated or killed.

The heavily traveled Mystic Falls trail where Monday's attack occurred includes a loop that leads to a 70-foot (21-meter) tall waterfall. The trailhead is about two miles (three kilometers) northwest of Old Faithful.