One man is dead and two others seriously injured after three unrelated incidents Monday in Yellowstone National Park. Park Spokesman Dan Hottle says a 56-year-old German visitor died of a head injury he sustained while riding a horse near Tower Junction Monday afternoon. Hottle says Carl Dullmaier was on a guided horseback tour out of Roosevelt when a couple of the horses spooked, spilling Dullmaier and a ten year old boy. The boy suffered lesser injuries in the incident. Hottle says another incident involved a 37-year-old man from Provo, Utah, who suffered thermal burns on the Solitary Geyser Trail in the Upper Geyser Basin . Hottle says the man (whose name is not being published) suffered burns on his arms legs and torso, and is currently being treated at the University of Utah Burn Center in Salt Lake City. The third man, 65-year-old visitor from Bangkok, Thailand, was seriously injured when a bull bison at Mammoth Hot Springs charged him and threw him into the air. The man was standing with a group of other park visitors watching the bison near the park store when the bull charged him. He was admitted for treatment at Memorial Hospital in Livingston, Montana.