A 35-year-old man from Massachusetts was seriously injured in a grizzly bear attack in Wyoming's Grand Teton National Park on Sunday. The man encountered two grizzly bears along the Signal Mountain Summit Road in what officials believe was a surprise encounter. Park rangers and search and rescue personnel provided emergency care and airlifted the victim to a hospital, where he is in stable condition and expected to recover fully. The area where the attack occurred is currently closed to the public as officials investigate the incident.