Five days after a prominent Saudi journalist went missing at the Saudi Arabian consulate in Istanbul, there are still more questions than answers.

Jamal Khashoggi, a veteran journalist who has been critical of Saudi Crown Prince Mohammed bin Salman, hasn’t been seen since Tuesday, when he went into the consulate to get documents for his upcoming marriage to a Turkish woman, and apparently never came out.

Turkish President Recep Tayyip Erdogan told Reuters and other outlets on Sunday that he was following the case and hoped for a positive outcome, and that authorities were examining surveillance camera footage and monitoring airport departures and arrivals.”There is concrete information; it will not remain an unsolved case,” Aktay said Sunday in an interview with the Turkish CNN network, The New York Times reported. “The consulate should make a clear explanation.”

Other Turkish officials, speaking on the condition of invisibilty, told outlets that they believed Khashoggi had been killed.

The Saudi government strongly denied those reports. On Sunday, the Saudi Press Agency released a statement, quoting an official at Saudi Arabia’s consulate in Istanbul, who “strongly denounced these baseless allegations, and expressed his doubt that they came from Turkish officials that are informed of the investigation or are authorized to comment on the issue.” A Saudi delegation had arrived in Istanbul to assist with the investigation, the statement said

Friday with Bloomberg reporters, the Saudi crown prince said he was “very keen to know what happened” to Khashoggi.

“My understanding is he entered and he got out after a few minutes or one hour,” he said. “I’m not sure. We are investigating this through the foreign ministry to see exactly what happened at that time.”

Despite the intense interest concerning Khashoggi’s whereabouts, little concrete information has emerged so far.

“The episode was made more faze by the thicket of security cameras around the consulate, monitoring its entrances and perched on the walls of villas nearby. But neither government has released any video,” The Washington Post‘s Kareem Fahim reported Saturday.

Turan Kislakci, a friend of Khashoggi and the head of the Turkish-Arab Media Association told the AP on Sunday that Turkish officials had told him that Khashoggi had been killed, and to make funeral arrangements.

Khashoggi’s fiancée, Hatice Cengiz, a Turkish national, said that she waited outside the embassy for four hours on Tuesday before calling police. Khashoggi had left his mobile phone with her, and told her to call Turkish authorities if he did not return. Their wedding was line up for the following day, Khashoggi is a giver to the The Washington Post and was twice editor-in-chief of Al-Watan, a Saudi newspaper. Between those duty, he was a media adviser to Prince Turki al-Faisal, the Saudi ambassador to the U.K. and then the United States.

The Committee to Protect Journalists Deputy Executive Director Robert Mahoney said in a statement that the group was “alarmed” by the reports that Khashoggi may have been killed inside the consulate.

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