US Secretary of State Mike Pompeo has held talks with the Turkish President Recep Tayyip Erdogan about missing Saudi journalist Jamal Khashoggi.
The meeting in Ankara comes amid fresh allegations in the Turkish media that Mr Khashoggi was killed inside the Saudi consulate in Istanbul.
On Tuesday, Mr Pompeo met Crown Prince Mohammed Bin Salman in Riyadh.
He said Saudi Arabia’s leaders “strongly denied” involvement in the writer’s disappearance.
Turkey’s Foreign Minister Mevlut Cavusoglu said the meeting had been “beneficial and fruitful.”
The journalist, a critic of the Saudi leadership, was last seen entering the consulate on 2 October. Saudi Arabia initially said he had left the building unharmed.
A pro-government Turkish newspaper has reported gruesome details alleging the writer was tortured and killed while inside the consulate.
The Yeni Safak newspaper reports that Saudi consul can be heard saying: “Do this outside. You’re going to get me in trouble.”
The New York Times reports that four of the 15 people named by the Turkish authorities as suspects in Mr Khashoggi’s disappearance have links to the powerful crown prince, while another is a senior figure in the country’s interior ministry.
Mr Khashoggi had obtained US residency and the US is a key ally of Saudi Arabia.
But US President Donald Trump has cautioned against rushing to blame Saudi Arabia over the case, telling the AP news agency that Riyadh was being treated as “guilty until proven innocent”.
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The case has put Saudi Arabia under pressure from close allies.
On Tuesday, G7 foreign ministers called for Saudi Arabia to conduct a “transparent” probe into the issue.
Meanwhile, International Monetary Fund chief Christine Lagarde has become the latest high-profile figure to withdraw from a major Saudi investment conference next week following Mr Khashoggi’s disappearance.
What is the state of investigation?
A search was due to be conducted on Tuesday of the consul’s residence, some 200m (656ft) away from the consulate.
But that has now been delayed because no Saudi official can be present for what has been billed as a joint investigation, Turkish officials say.
The consul, Mohammad al-Otaibi, left Turkey on a commercial flight bound for Saudi Arabia earlier in the day.
On the day of Mr Khashoggi’s disappearance, several vehicles with Saudi diplomatic number plates were seen on video footage moving from the consulate to the residence.
Meanwhile, Turkish investigators quoted by two news agencies say Monday’s search of the consulate itself has yielded more evidence that Mr Khashoggi was killed there.