A man was gored by a bison in Yellowstone National Park, despite warnings for people to keep their distance from the animals, officials said.
The 34-year-old man was walking with his family on a boardwalk in the park in Wyoming when a bison charged at the group, the National Park service said in a statement Tuesday.
"Family members did not leave the area, and the bull bison continued to charge and gored the male," the statement said.
The man sustained an injury to his arm and was transported by ambulance to a hospital.
A video, said to have been filmed by a park goer and published by local media, showed a bull bison charging at a small group of people, who don't appear to retreat right away. The bull then lunges at an adult and a child, before they run away trying to escape.
The agency said this was the second incident this year of a bison goring a visitor who got too close.
Bison are unpredictable animals that can run three times faster than humans, and people should always stay some 25 meters (yards) away from them, the agency added.