He also held a second meeting with Fidan and visited the Saudi consulate in Istanbul.
"Who sent these 15 people?"
Following the global outrage over the macabre circumstances on Jamal Khashoggi's case, the Saudi public prosecutor reversed its statement and declared that the killing was premeditated.
"Now we have to solve this case".
He also met Saudi Arabia's King Salman bin Abdelaziz.
The statement came short of accusing the Saudis of non-cooperation talking about meeting of the Saudi Chief Prosecutor Saud al-Mojeb and his entourage with Turkish law enforcement authorities earlier this week.
Celik also said it was not possible that Saudi officials had still not found the journalist's body after almost a month of investigations.
Saudi Arabia has arrested 18 suspects, who, it says, will be prosecuted in Saudi Arabia. Riyadh has refused the request.
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Cengiz also told the memorial that she wishes she had entered the consulate instead of her fiance. "He should not allow my fiance's murder to be covered up".
The murder of the journalist Jamal Khashoggi could not be made without the approval of senior officials of Saudi Arabia.
Those allegations were a key reason for the U.S. withdrawal - with the backing of Saudi Arabia, the United Arab Emirates, and Israel - from the 2015 worldwide agreement that curbed Iran's nuclear program and for the re-imposition of crippling economic sanctions.
Under mounting worldwide pressure, Saudi Arabia has changed its narrative about Khashoggi's killing several times, and has recently acknowledging that Turkish evidence shows it was premeditated. The Saudi leadership has since blamed a "rogue operation".
When asked about the killing during a panel discussion at the conference, Jubeir complained about the media "hysteria" and the rush to pin blame on the Saudi royal family before the investigation is complete.
"Let's know who this co-conspirator is, we can shed further light".
The prosecutor's statement comes just as his Saudi counterpart departed for Riyadh, following two days of attempted cooperation between the nations.
Al-Mojeb, the prosecutor visiting Istanbul, was named attorney general by Saudi King Salman previous year after a palace shakeup that saw Prince Mohammed sideline his elder, more experienced cousin, Mohammed bin Nayef, for the title of crown prince.