We visited a retired Ranger in Bozeman last weekend. He's 2nd generation Park Service and retired from Yellowstone 10 years ago. He's into park history and has seen a lot of it, though this event predates him by a good bit. He pulled out this letter from 1902. It reads:
September 11, 1902
The Acting Superintendent of Yellowstone National Park
The Department has been advised that a gentleman at the Lake Hotel on the morning of the 6th instant, while playing with two cub bears recently captured by bell boys of that hotel and afterwards turned loose, was suddenly attacked by the mother of the cubs and probably fatally injured, having his ribs crushed in the assault.
I have to request that you will submit a report at the earliest practicable date as to the facts in the case and whether the same can be attributed to the carelessness or negligence of any of the employees in the park, with such recommendation as you may deem appropriate for the better protection of life and property from this class of animals.
Pats. & Miscls. Div.
Here is the letter: