Khashoggi has been missing since he entered the consulate in Istanbul on Tuesday, and Turkish police investigating his disappearance issued a statement saying that 15 Saudis, including several officials, entered the consulate while he was inside, Turkey's Anadolu news agency reported.
In an article published in The Washington Post a year ago, Mr Khashoggi said a new era of "fear, intimidation, arrests and public shaming" had dawned in Saudi Arabia.
"His friends had warned him (Khashoggi), 'Do not go there, it is not safe, ' but he said they (the Saudis) could not do anything in Turkey", said Aktay.
Two days before entering the Saudi consulate in Turkey, Jamal Khashoggi appeared at Middle East Monitor's conference on the legacy of the Oslo Accords in London. "We believe that the murder was premeditated and the body was subsequently moved out of the consulate".
Thank you for signing up..
Hatice said he left the phone with her and told her to call an adviser to Turkish President Recep Tayyip Erdogan if he did not return. "Such an assassination within the grounds of the Consulate, which is territory under Saudi Arabian jurisdiction, would amount to an extrajudicial execution", said Lynn Maalouf, Amnesty International's Mideast research director. "He is imposing very selective justice", Khashoggi wrote in the Post past year after he fled the kingdom, saying he feared returning home. "As the president of the Turkish Republic I am following it, chasing it and, whatever conclusions come from here, we will inform the world about it", he said.
Erdogan said that CCTV footage of entrances and exits at the consulate and the airport in Istanbul were being studied by the police.
Turkish prosecutors have opened an investigation into the disappearance of a missing Saudi journalist. The US government has so far said that it can not confirm the reports of what happened to him, but is following the case.More news: Jury convicts Chicago officer of 2nd-degree murder
More news: The mystery remains unsolved as NASA addresses an unexplained space station hole
More news: Melania Trump spotlights USAID reading programme in Malawi
One Turkish official also told The Associated Press that detectives' "initial assessment" was that Jamal Khashoggi was killed at the consulate, without elaborating.
Jamal Khashoggi, the Saudi journalist who disappeared last week after a visit to his country's consulate in Turkey, was a Saudi insider. "We will see and we want a result from here of course with speed".
Over the past year, he has written columns for newspapers including the Washington Post criticizing Saudi policies toward Qatar and Canada, the war in Yemen and a crackdown on dissent which has seen dozens of people detained.
Kislakci also alleged, based on conversations with officials he did not name, that Khashoggi was made to "faint", then was dismembered.
On Tuesday, Khashoggi went into the consulate for a quick in and out to get a document certifying his divorce.
His foreign policy moves have been extremely aggressive, including his military support of the government in Yemen against Iranian-backed Houthi rebels and nearly going to war with Qatar due to their support of the Iranian regime. Mr Khashoggi, 59, has more than 1.6 million Twitter followers and has written for the Washington Post opinion section.
Pressed on how he would regard Trump's humiliating rhetoric against Saudi Arabia, the crown prince described the controversial remarks as a "bad issue" offset by "99 percent of good things".