The whereabouts of Jamal Khashoggi, a prominent Saudi Arabian journalist and critic of the Saudi authorities remain unknown since he entered the Saudi consulate in Istanbul last Tuesday.
Police in Turkey have been refusing to acknowledge that they have been holding people in custody following mass detentions carried out across Istanbul.
The murder on 19 January 2007 of prominent editor Hrant Dink in Istanbul, Turkey "is a devastating development," said Archbishop Vicken Aykazian, diocesan legate and ecumenical officer, Diocese of the Armenian Orthodox Church of America.