A member of Saudi Crown Prince Mohammed bin Salman’s entourage made four calls to the royal’s office from the Saudi Consulate in Istanbul the day Jamal Khashoggi was killed there, a pro-government Turkish newspaper reported Monday.

The report comes just a day before Prince Mohammed’s high-profile investment summit is to begin in Riyadh and Turkish President Recep Tayyip Erdogan has promises that details of Khashoggi’s killing “will be revealed in all its nakedness.”

That yet again adds to the pressure Saudi Arabia faces over the slaying of the Washington Post columnist. The kingdom’s claim on Saturday that Khashoggi died in a “fistfight” met international skepticism and allegations of a cover-up to absolve the 33-year-old crown prince of direct responsibility.

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WATCH: New CCTV still images emerge showing Khashoggi arriving at Saudi Arabia consulate.

1:00 New CCTV still images emerge showing Khashoggi arriving at Saudi Arabia consulate New CCTV still images emerge showing Khashoggi arriving at Saudi Arabia consulate

Turkish media reports and officials maintain that a 15-member Saudi team flew to Istanbul on Oct. 2, knowing Khashoggi would arrive for a document he needed to get married. Once he was inside the diplomatic mission, the Saudis accosted Khashoggi, cut off his fingers, killed and dismembered the 59-year-old writer.

WATCH: Saudi Arabia facing backlash over Khashoggi explanation

2:40 Saudi Arabia facing backlash over Khashoggi explanation Saudi Arabia facing backlash over Khashoggi explanation

The report by Yeni Safak on Monday said Maher Abdulaziz Mutreb, a member of Prince Mohammed’s entourage on trips to the United States, France and Spain this year, made the calls from the consulate. The newspaper said the four calls went to Bader al-Asaker, the head of Prince Mohammed’s office. It said another call went to the United States.

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Yeni Safak cited no source for the information. However, pro-government newspapers have been leaking information about Khashoggi’s killing, apparently with the help of Turkish security forces. Yeni Safak reported last week that Saudi officials cut off Khashoggi’s fingers and then decapitated him at the consulate as his fiancée waited outside.

Officials in Saudi Arabia have not answered repeated requests for comment from The Associated Press in recent days, including on Monday. Saudi Arabia so far has not acknowledged or explained Mutreb’s presence in Istanbul — nor that a forensics and autopsy expert was also on hand for Khashoggi’s arrival at the consulate.

Last week, a leaked photograph apparently taken from surveillance footage showed Mutreb at the consulate, just ahead of Khashoggi’s arrival. Mutreb’s name also matches that of a first secretary who once served as a diplomat at the Saudi Embassy in London, according to a 2007 list compiled by the British Foreign Office.

Meanwhile, Saudi state media reported that both Prince Mohammed and King Salman made calls to Khashoggi’s son, Salah, early on Monday morning. Statements from the agency said both the king and the crown prince expressed their condolences for Khashoggi’s death.

A Saudi friend of Khashoggi who was in frequent touch with him before his death told the AP that Salah Khashoggi had been under a travel ban and barred from leaving the kingdom since last year as a result of his father’s criticism of the government. The friend spoke on condition of anonymity for fear of repercussion. The Saudi statements did not acknowledge the ban.

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WATCH: Video from night of Khashoggi’s disappearance shows fiance waiting outside Saudi consulate

0:40 Video from night of Khashoggi’s disappearance shows fiance waiting outside Saudi consulate Video from night of Khashoggi’s disappearance shows fiance waiting outside Saudi consulate

Five Turkish employees of the consulate also gave testimonies to prosecutors on Monday, Turkish media reported. Istanbul’s chief prosecutor had summoned 28 more staff members of the Saudi Consulate, including Turkish citizens and foreign nationals, to give testimony. Some Turkish employees reportedly said they were instructed not to go to work around the time that Khashoggi disappeared.

Saudi Foreign Minister Adel al-Jubeir on Sunday told Fox News that Khashoggi’s killing was “a rogue operation” and that “we don’t know where the body is.”

“The individuals who did this did this outside the scope of their authority,” he said. “There obviously was a tremendous mistake made and what compounded the mistake was the attempt to try to cover up. That is unacceptable to the government.”

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However, leading Republicans and Democrats in Congress are saying Saudi Arabia should face punishment over Khashoggi’s killing. President Donald Trump also had talked about possible punishment but said he didn’t want to halt proposed arms sales to Saudi Arabia because, he maintained, it would harm U.S. manufacturers.

Britain, Germany and France issued a joint statement condemning the killing of Khashoggi, saying there is an “urgent need for clarification of exactly what happened.”

In a statement Sunday, the governments said attacks on journalists are unacceptable and “of utmost concern to our three nations.” They said the “hypotheses” proposed so far in the Saudi investigation need to be backed by facts to be considered credible.

German Chancellor Angela Merkel told reporters in Berlin on Sunday that she supports a freeze on arms exports to Saudi Arabia. German Economy Minister Peter Altmaier underlined that point Monday, calling for a joint European position as Germany “won’t at this point approve any further arms exports because we want to know what happened.”