The Washington Post announced on Friday that Turkish authorities have told U.S officials that they have audio and video evidence that proves journalist Jamal Khashoggi was murdered and dismembered inside the Saudi Arabian consulate in Istanbul. According to Post, the audio recording is particularly a “persuasive and gruesome evidence” that the Saudi team sent to Istanbul was responsible for Khashoggi’s murder. One anonymous source has told Washington Post that in the audio “you can hear how he was interrogated, tortured, and then murdered.

Washington Post has cited anonymous officials saying the recording shows a Saudi security team detaining Khashoggi after he arrived at the consulate over a week ago. He was there to pick up documents related to his upcoming wedding.

Turkish officials have not commented on Washington Post’s claim, and the Associated Press was not able to confirm it.

Saudi Arabia has rejected the allegations as “baseless”, however, they have not provided any evidence that would show Khashoggi leaving the consulate as they claim. Khashoggi’s fiancée, Hatice Cengiz, was waiting for him outside the consulate, but never saw him come out.

A Saudi Arabian delegation has arrived in Turkey on Friday as part of an investigation into the journalist’s disappearance.

Khashoggi was a columnist for the Washington Post and a vehement critic of the crown prince of Saudi Arabia, Mohammad bin Salman.