A medical examination found no injuries which might have led to their deaths, and it was concluded that they had all died of hypothermia. One person had a small crack in his skull, but it was not thought to be a fatal wound.
An examination of the four bodies which were found in May changed the picture. Three of them had fatal injuries; the body of Thibeaux-Brignolle had major skull damage, and both Dubunina and Zolotarev had major chest fractures. The force required to cause such damage would have been extremely high, with one expert comparing it to the force of a car crash. Notably, the bodies had no external wounds, as if they were crippled by a high level of pressure. One woman was found to be missing her tongue. There had initially been some speculation that the indigenous Mansi people may have attacked and murdered the group, for encroaching upon their lands, but investigation indicated that the nature of their deaths did not support this thesis; the hikers' footprints alone were visible, and they showed no sign of hand-to-hand struggle.
Another group of hikers (about 50 kilometers south of the accident) reported that they saw strange orange spheres in the night sky to the north (likely in the direction of Kholat Syakhl) at the same date as the accident happened. Similar "spheres" were observed in Ivdel and adjacent areas continually during the period of February to March 1959, by various independent witnesses (including the meteorology service and the military).
Metal fragment found at the scene in 2007
A random timeline with some interesting lore attached

The search party,reminds me of the footage of the Norwegians in The Thing
EDIT:I'm pretty certain the smiley face in the first image is a watermark,if it isn't...WTF lol