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Jamal Khashoggi was strangled shortly after entering the Saudi consulate in Istanbul, and his body was dismembered afterward, Turkish officials said.
The Chief Prosecutors' Office of Istanbul made the announcement on Wednesday.
It is the most detailed official account of the journalist's death so far.
The prosecutor also demanded that his Saudi counterpart detail the whereabouts of Khashoggi's body. Riyadh previously claimed that Khashoggi's body was wrapped up in a sort of fabric and given to a local Turkish co-conspirator.
More follows.