Saudi Arabia's foreign minister, however, says the kingdom will try the perpetrators and bring them to justice after the investigation is completed.
The fiancée of Jamal Khashoggi on Monday criticized President Donald Trump's response to his killing, urging him to set aside USA trade interests in the push for truth, and demanded Riyadh disclose more details to bring those who ordered it to justice.
The killing has tainted the image of Prince Mohammed, who has positioned himself as a Saudi reformer, and tested ties between Washington and Riyadh as Western powers demand answers over Mr Khashoggi's death.
On October 19, Saudi Arabia admitted the journalist had died during a fistfight inside the consulate.
The two countries have announced a joint investigation of the journalist's killing in Saudi Arabia's consulate in Istanbul, although Turkey has leaked evidence to the media in an apparent effort to pressure its regional rival over the crime committed by Saudi officials.
Asked about the whereabouts of Khashoggi's body, which remain a mystery almost a month after his death, Cavusoglu said that "as those who committed the murder are in Saudi Arabia, Saudi Arabia has a very large responsibility". Some of those implicated in the killing are close to Crown Prince Mohammed bin Salman, the kingdom's heir-apparent whose condemnation of the killing has failed to ease suspicions that he was involved.
US Defence Secretary Jim Mattis said Sunday that Al Jubeir assured him that Riyadh would conduct a "full" investigation, adding he was confident the probe would include Turkey's findings. I want justice to be served.
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He clarified later that the murder and cover-up should have never happened. The U.S. has faced criticism as having a responsibility in the conflict because of its military support for Saudi Arabia, including providing intelligence, training and targeting information.
She said the West is considered a stronghold of human rights and democracy so it should stand up to the killers of her husband-to-be.
"Let's not let money taint our conscience and compromise our values".
But the administration wants to see Saudi Arabia resolve the Qatar crisis and take similar steps toward its widely criticized war in Yemen, according to one US official who, like the other people cited in this story, asked not to be identified.
Earlier this month U.S. Secretary of State Mike Pompeo met the Saudi king and crown prince to discuss the issue.
Turkish law required that Mr. Khashoggi, who was divorced, provide proof that he did not have a wife and thus his trip to the consulate.
Turkish officials have said the journalist was tortured and killed on the consulate premises and that his body was then removed.
"I believe the Saudi regime knows where his body is", she told the audience at the service, sponsored by the Middle East Monitor and Al Sharq Forum.