The Washington Post published a surveillance image on Tuesday showing its missing Saudi contributor walking into the Saudi Consulate in Istanbul a week ago, just before he disappeared. Turkish officials have said they fear the columnist was killed there.
The image released by the Post bore a date and date stamp. The Post said "a person close to the investigation" shared the image with them.
Khashoggi, 59, went missing while on a visit to the consulate in Istanbul for paperwork to marry his Turkish fiance. The consulate insists the writer left its premises, contradicting Turkish officials.
As a contributor to the Post, Khashoggi has written extensively about Saudi Arabia, including criticizing its war in Yemen, its recent diplomatic spat with Canada and its arrest of women's rights activists after the lifting of a ban on women driving. All those issues have been viewed as being pushed by Prince Mohammed, who similarly has led roundups of activists, businessmen and others in the kingdom.
"Now when this person enters, whose duty is it to prove that he left or not? It is (the duty) of the consulate officials," Erdogan said during a visit to Hungary.
"Don't you have cameras and other things? Why don't you prove it, you have to prove it." Turkey summoned the Saudi ambassador on Sunday to request the kingdom's "full cooperation" in the investigation, a Foreign Ministry official said.
The officials spoke on condition of anonymity because they were not authorised to talk to reporters about the subject.
Ties between Ankara and Riyadh are at a low point over Turkey's support for Qatar in its year-long dispute with Saudi Arabia and other Gulf nations. Turkey sent food to Qatar and deployed troops at its military base there.
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