Saudi Arabia's Crown Prince Mohammed bin Salman Al Saud told Bloomberg on Friday that Khashoggi was not in the consulate, and his country is investigating. He has not been heard from since October 2, when he entered a Saudi Arabian consulate in Turkey to receive marriage paperwork.
Turkish investigators have hinted they know more about the disappearance than they have disclosed. Turkish officials have said they fear the columnist was killed at the premises.
The source said Turkish officials were trying to identify them.
NBC also reports that two other people said he was told to return another day after going to the consulate in Istanbul.
The Washington Post released on Tuesday what appears to be the last-known photograph of Khashoggi, walking into the Saudi consulate from which he apparently never left.
During the meeting, Ryan expressed The Post's "grave concern" about Khashoggi's disappearance, and said the news organization would view any Saudi government involvement in his disappearance as a flagrant attack on one of its journalists.
"Based on their initial findings, the police believe that the journalist was killed by a team especially sent to Istanbul and who left the same day", the official told AFP on Saturday, October 6.
Turkish security sources confirmed the newspaper's report to MEE, and added that "there were intensive moves in and out of the consulate" last Tuesday. On Sunday, another official assessed it as "high probability" that Khashoggi was killed in the consulate and his body was taken away.
The suspects reportedly left the area with two cars whose license plates could be read by the police.
He added that he still hoped the reports of his friend's death were untrue.
According to diplomatic sources, a diplomatic note was sent to the Turkish Foreign Ministry inviting Turkish officials to visit the consulate.
Saudi Arabia, naturally, has denied any involvement.
According to his fiancee Cengiz, Khashoggi had visited the consulate to receive an official document for his marriage. "The consulate officials can not save themselves by simply saying "he has left", Erdogan told a news conference in Budapest, where he is on an official visit.
A member of the Saudi elite, he had remained in exile in the USA for much of the past year, from where he wrote columns for The Washington Post critiquing aspects of the Kingdom's reform programme. As a contributor to the Post, Mr Khashoggi has written extensively and critically about Saudi Arabia.
"Everything is being inspected, especially entries and exits out of Istanbul, the airport", he said. We're waiting for the prosecutor's statement. A former Muslim Brotherhood member who befriended Osama bin Laden but later condemned his violence, Khashoggi became a leading proponent for Arab reform-some of the same reforms, in fact, that MBS has spearheaded as part of his Vision 2030 campaign for the kingdom.
"It's very, very sad for us that this happened in our country", the Turkish president said. Violence against journalists across the globe is a threat to freedom of the press and human rights.
"If true, this would be an abysmal new low".
The Foreign Ministry said Saudi authorities have notified Ankara they are "open to co-operation" and will allow the consulate building to be searched.