Khashoggi was one journalist who chose to "report the reality".
Turkish security officials were working to identify the 15 individuals, English-language state broadcaster TRT World reported, adding that Turkish officials believe the Saudis may have taken the consulate's CCTV footage with them when they returned to Saudi Arabia.
Turkish officials have said they believe Khashoggi, 59, a critic of the Saudi leadership and a contributor to The Washington Post's Global Opinions section, was killed by a team of 15 Saudis flown in specifically to carry out the attack.
The incident has put into sharp focus Saudi Arabia's young Crown Prince Mohammed bin Salman's perceived crackdown on dissidents, his kingdom's delicate relationship with Turkey and Khashoggi 's influence within the royal court. In a letter sent Monday evening, the prince said it is "absolutely false, and baseless", to accuse the kingdom of killing or detaining Khashoggi, according to NBC news.
Although the location has been confirmed to be correct, definitive confirmation of the picture to show Khashoggi on the day of his disappearance has not been provided yet.
"Jamal has many friends in the Kingdom, including myself", Khalid wrote.
Saudi Arabia's consul in Istanbul opened his mission to Reuters on Saturday in an effort to show that Khashoggi was not on the premises.
The image was given to the Post by someone close to the Turkish investigation, and released by the U.S. daily soon after Turkey's President Recep Tayyip Erdogan challenged the Saudis to prove he left the consulate unharmed. Saudi officials say he left shortly afterwards but his fiancee, who was waiting outside, said he never came out.
Fears are growing over the fate of missing journalist Jamal Khashoggi after Turkish officials said they believe he was murdered inside the Saudi consulate.
Saudi Arabia's envoy to Ankara was summoned to the foreign ministry for a second time on Sunday. Turkey, it said, must back up its conclusion Khashoggi was killed by making public any evidence it has.
Khashoggi is seen in a surveillance photo published by the Washington Post entering the consulate where Turkish officials believe he was killed earlier this month.
The private DHA agency said the planes, which it identified as two Gulfstream jets belonging to a Riyadh-based company, landed at Istanbul's Ataturk Airport on the day Khashoggi vanished. Relations were already strained after Turkey sent troops to the Gulf state of Qatar previous year in a show of support after its Gulf neighbors, including Saudi Arabia, imposed an embargo on Doha.
"It's very, very sad for us that this happened in our country", the Turkish president said.
Khashoggi was right about Saudi repression.
Republican Senator Lindsey Graham said Riyadh must provide "honest answers" to the claims that he was murdered.
Fusun Arsava, an worldwide law professor at Ankara's Atilim University, told Al-Monitor that even if reports of Khashoggi's murder were true, that would be extremely hard for the Turkish authorities to prove.
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