Climbers death because of unknown power

Nine people mysteriously died after fleeing their tent at nite in sub-zero temperatures, while camping on a mountain on Feb 2, 1959! Six were found dead, due to hypothermia; while one died from major skull damage. Two others died from chest fractures due to an extreme unknown force! One woman even had her tongue ripped out! High doses of radio-active contamination was found on the bodies, although the source remains unknown. Their bodies were found in the snow, surrounded by only their own footprints, it was concluded they had left their tent, which was ripped open from the inside, on their own free will.