"We call for cooperation between Turkey and Saudi Arabia to conduct a prompt and impartial investigation into the circumstances of Mr Khashoggi's disappearance and to make the findings public", United Nations human rights spokeswoman Ravina Shamdasani told a Geneva news briefing.
A pro-government Turkish newspaper has published the names and photographs of 15 Saudi nationals who allegedly arrived in Istanbul on board two private jets the day journalist Jamal Khashoggi went missing. "We're probably getting closer than you might think".
Erdogan was informed of the conclusions Saturday, the Times reported, citing unnamed sources - and he has since dispatched officials to anonymously tell news outlets, including the Times.
Turkish officials fear Mr Khashoggi was killed by the Saudis after walking into the kingdom's consulate in Istanbul on October 2, though they have not offered any evidence to support that.
The relationship between Saudi Arabia and Turkey has always been contentious. Its passengers went straight to the consulate and then left in the evening for Egypt.
U.S. Secretary of State Mike Pompeo acknowledged the conflicting reports about the safety and whereabouts of Khashoggi.
But Turkish government sources said police believe Khashoggi was killed by an assassination team sent to Istanbul. When he was asked whether the writer's disappearance could put those ties in jeopardy, Trump said: "I have to find out what happened". Riyadh's envoy in Ankara was first called to the ministry on Wednesday.
"Deputy foreign minister Sedat Onal invited the Saudi Arabian ambassador to the ministry yesterday".
"The information on the US appointment of an investigator is not true", sources who asked not to be named due to restrictions on speaking to the media, told Anadolu Agency.
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The two countries have such an obligation under both criminal law and global human rights law, she said.
"It reflected their efforts from their perspective to show that stories or rumours that Jamal Khashoggi had been adducted or was being held inside the consulate were not true".
Mr Khashoggi was a regular contributor to The Post, and colleagues there have said he often expressed concern for his safety because of his writing.
"These are extremely serious allegations", said a British Foreign Office representative in a statement.
Khashoggi's fiancé told the authorities that he was required to submit his cell phone to Saudi officials upon entering the building - a practice that is not uncommon.
Saudi authorities have said they do not have security footage from that day.
Trump, who took his first overseas trip as United States president to the kingdom and whose son-in-law Jared Kushner has close ties to Prince Mohammed, said Tuesday he had not yet talked to the Saudis about Khashoggi, "but I will be at some point", without elaborating.
Kalin told reporters that the agreement was reached upon Riyadh's request.