A year to the day after Malaysia Airlines Flight 17 was shot down over Ukraine, an Australian news organization released a video purporting to show pro-Russian separatists walking amid the wreckage, expressing increasing dismay as item after item indicates that the aircraft was a passenger jet.

The video, whose authenticity has not been independently verified, was released on Friday by News Corp Australia, which did not say how it had obtained it. Thirty-eight Australian citizens and permanent residents were among the 298 people killed on the flight, and the video emerged on the day a memorial to them was dedicated in Canberra, the capital.

Foreign Minister Julie Bishop said she could not confirm that the video was authentic, but she told the Nine Network that the footage was “sickening to watch” and called it “deeply concerning” that it emerged only a year after the crash.