A bear has attacked a man who entered its enclosure at a new park in Switzerland, and a policeman opened fire on the animal to defend the intruder.

Police say the 25-year-old man and the 3-year-old bear both were injured on Saturday at Bear Park in the city of Bern. The small park, which opened last month, provides two bears with hill slopes, grasslands, a river and a cave.

Police say the mentally handicapped man climbed onto a wall surrounding the park and fell 13 feet into the bears' enclosure. One of the bears responded by attacking the man, injuring his head and one leg.

A nearby policeman shot at the bear, injuring it and forcing it to retreat into the cave.

The bear was being treated at the park and the man at a nearby hospital.