A Yellowstone National Park trail remains closed after a possible grizzly bear attacked a hiker, leaving him with serious but non life-threatening injuries.

The 29-year-old man suffered injuries to his chest and arm in Tuesday's attack on the Turbid Lake Trail northeast of Yellowstone Lake.

The man encountered the bear 4km into the backcountry and sprayed bear repellent as it began to attack, park officials said in a statement.

National Park Service medics walked out with the hiker.

He was then taken to a park clinic and flown to a nearby hospital.

Park officials said on Wednesday they had no more information including the man's name, where he was from and updated condition.

It was the park's first bear attack since a grizzly injured a hiker in the Mammoth Hot Springs area in 2021.

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