The request came prior to a report by the UN special rapporteur urging investigation of the murder.

"Most, if not all, would have a vested interest in ensuring it does not take place," one official said.

The death prompted outrage around the world, with governments and human rights organizations calling for those involved to be held accountable.

It is the first time that Mohammed bin Salman, the kingdom's de facto ruler, has publicly indicated personal accountability for the killing inside the Saudi consulate in Istanbul

Even as rebukes pile up elsewhere, some leaders in Osaka have gone out of their way to make sure the Saudi prince feels comfortable.

An independent U.N. expert’s searing report alleges that Saudi Arabia was responsible for the killing of Saudi journalist Jamal Khashoggi,

Last week, an independent U.N. report on the killing found "credible evidence" to warrant further investigation into the possible role of Saudi Crown Prince Mohammed bin Salman.

A United Nations-led inquiry into Khashoggi's murder said that evidence pointed to a brutal crime "planned and perpetrated" by Saudi officials.

Amnesty International said last month it had documented 10 cases of torture and abuse, including sexual harassment, electrocution, flogging and death threats.

A Turkish pro-government television channel has broadcast video showing men carrying suitcases purportedly containing the remains of Saudi journalist Jamal Khashoggi into the residence of his country's consul general in Istanbul.