A statement from chief Istanbul prosecutor Irfan Fidan's office added that Mr Khashoggi's body was dismembered and disposed of.
"Who sent these 15 people?"
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.
"Now we have to solve this case".
"This needs to be solved now; there is no point in excuses", Erdogan told journalists.
In wake of the murder, Germany suspended export licenses to Saudi, while US Secretary of State Mike Pompeo invalidated visas of Saudi officials who are believed to be part of the plot to murder the journalist.
Turkey is seeking the extradition of 18 suspects detained in Saudi Arabia over the journalist's slaying.
Mojeb met with Fidan again on Tuesday before entering the consulate without making a statement.
Her remarks came days after she rejected an invitation from Trump to visit the White House, CNN reported.
Speaking at a memorial in London on Monday, Hatice Cengiz expressed disappointment in the "leadership of many countries". She called on Turkish and Saudi authorities to cooperate in ensuring that the truth be revealed. He should not pave the way for a cover-up of my fiancee's murder. While Trump condemned the murder, calling it "one of the worst cover-ups in the history of cover-ups", he stated that the U.S. should not criticise the Saudi regime owing to the impending multi-billion dollar arms agreement between the two counties.
Under mounting pressure, Saudi Arabia changed its narrative about Khashoggi's killing several times, eventually admitting Khashoggi died inside the consulate.
The ruling Justice and Development Party (AK Party) spokesperson Ömer Çelik said Wednesday that Saudi journalist Jamal Khashoggi could not have been killed without orders from high-level positions.
The reputational damage suffered by Prince Muhammad embarrasses UAE Crown Prince Muhammad bin Zayed, who, together with his aides and representatives in world capitals, has worked hard to project his Saudi counterpart as the kingdom's future.
Since the murder was discovered, a chorus of United Nations officials have demanded a probe into Khashoggi's case, including Secretary-General António Guterres, who stressed the need for a "prompt, thorough and transparent investigation into the circumstances of Khashoggi's death and full accountability for those responsible".