Dutch prosecutors say the body of one passenger of Malaysia Airlines Flight 17 was found wearing an oxygen mask, raising questions about how much those on board knew about their fate when the plane plunged out of the sky above Eastern Ukraine in July.

Prosecution spokesman Wim de Bruin says the passenger, an Australian, did not have the mask on his face, but its elastic strap was around his neck.

De Bruin says it is not known "how or when the mask got around the victim's neck."

All 298 passengers and crew died when the jet flying from Amsterdam to Kuala Lumpur crashed July 17. Dutch investigators said last month it was likely struck by multiple "high-energy objects from outside the aircraft," causing it to break up.