The CIA is allegedly in possession of a recording of a phone call in which Saudi Arabia's crown prince is heard giving instructions to "silence" journalist Jamal Khashoggi.
Crown Prince Mohammed Bin Salman can be heard calling for Mr Khashoggi to be "silenced as soon as possible" in the "smoking gun" audio recording, Turkey's Hurriyet Daily news reported.
The Turkish newspaper reported on Thursday that CIA director Gina Haspel "signalled" to Turkish officials during her trip to Ankara last month that the agency was in possession of the wiretapped phone call.
Asked about the report, a Turkish official told Reuters he had no information about such a recording.
Saudi Arabia has said the crown prince had no prior knowledge of Mr Khashoggi's killing at the Saudi consulate in Istanbul six weeks ago.
"There is talk of another recording," Hurriyet newspaper journalist Abdulkadir Selvi wrote in a column, saying the alleged call took place between Prince Mohammed and his brother, Saudi Arabia's ambassador to Washington.
"It is being said that CIA chief Gina Haspel indicated this during her visit to Turkey," he wrote, adding that they had discussed Mr Khashoggi, a critic of the kingdom's de facto ruler.
"It is being said the crown prince gave orders to 'silence Jamal Khashoggi as soon as possible'," in a call which was monitored by the US agency, he said.
Mr Khashoggi was killed at the Saudi consulate in Istanbul on October 2 in an operation that Turkey's President Tayyip Erdogan has said was ordered by the highest level of Saudi leadership.
After offering numerous contradictory explanations, Riyadh said last week Mr Khashoggi had been killed and his body dismembered when negotiations to persuade him to return to Saudi Arabia failed.
