Turkish police were limited to footage from two street cameras that monitor the street outside the consulate after Saudi officials claimed that security cameras inside the consulate were not working at the time of last week's incident.
"Embassy employees or consulate employees have plenty of time to clean a potential crime scene, and if there was a crime, they certainly would have done that", Federal Bureau of Investigation veteran Martin Reardon told the ABC's The World program.
The foreign secretary, Jeremy Hunt, has warned Saudi Arabia that its friendship with the United Kingdom depends on shared values, after he demanded answers over claims that a Saudi hit squad may have played a role in the disappearance and possible killing of Jamal Khashoggi. It would make it more hard for the two governments to come up with a face-saving story blaming Khashoggi's disappearance on some third party, on rogue elements of the Saudi security forces, or on an accident during an interrogation that went wrong. There is no evidence he ever left.
When was he last seen?. "Jamal is a Saudi citizen whose safety and security is a top priority", he said.
But Khashoggi's fiancée is reportedly holding out hope, tweeting in Arabic late Saturday and translated by the Middle East Eye, "Jamal was not killed, and I don't believe that he was killed", the fiancée said. Relations were already strained after Turkey sent troops to the Gulf state of Qatar past year in a show of support after its Gulf neighbors, including Saudi Arabia, imposed an embargo on Doha. One was an autopsy expert.
Turkey's state news agency, quoting unnamed sources, said Saudi Arabia's Ambassador to Ankara, Waleed A Elkhereiji, was summoned to the Turkish Foreign Ministry on Sunday.
Saudi Arabia has denied involvement. He served as an adviser to senior Saudi officials. Erdogan may prefer not to alienate the kingdom as he struggles to manage a troubled economy and a many-sided power struggle over the outcome of the civil war in neighbouring Syria. The Turkish private NTV television said Ankara asked for permission for its investigators to search the consulate building, but a Foreign Ministry official would not confirm the report. That need for secrecy could also hamper any efforts to prosecute any Saudi agents involved.
"Now when this person enters, whose duty is it to prove that he left or not?" "I said nothing. I didn't want to lose my job or my freedom". He also anxious that pushing the Saudis too hard in public could drive them into the waiting arms of Russian Federation, which sets a far lower bar for human rights and press freedom.
Mr Khashoggi, 59, went missing while on a visit to the consulate in Istanbul for paperwork to marry his Turkish fiancée.
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On Monday President Trump said that he was "concerned" about reports on Khashoggi's disappearance.
Politico noted that both Secretary of State Mike Pompeo and Vice President Mike pence both put out much stronger statements than the president, calling for an investigation and defending the rights of journalists.
The United Nations human rights office also called for Saudi Arabia and Turkey to conduct a thorough investigation and to make the results public. (Reporter) What do you know at this point?
One jet, carrying nine people, allegedly landed in the early hours of October 2.
In the meantime, Turkey could declare individual Saudi diplomats as "persona non grata" - meaning they are no longer recognised, ending their diplomatic immunity - or it could effectively close down the consulate in order to gain access to the alleged crime scene.
He was was flown to Dubai and then Riyadh, where he is now being held.
Mr Hunt's intervention followed the publication of a CCTV image apparently showing Mr Khashoggi walking into the Saudi consulate in Istanbul, just before he went missing. It is unclear whether those on board traveled to either the consulate or the residence.
"At this time, I implore President Trump and first lady Melania Trump to help shed light on Jamal's disappearance", she said.
Erdogan's comments were his most direct suggestion yet of potential Saudi culpability in Khashoggi's disappearance.
Meanwhile, the BBC published off-air audio from an interview Mr Khashoggi gave in London, three days before he disappeared. But his friends cancelled those plans, and they could not be reached to explain their decision.