Jamal Khashoggi’s last words before he died were “I can’t breathe,” according to a report citing a source who has read a full transcript of the journalist’s murder.

Khashoggi was killed after he entered the Saudi consulate in Istanbul on 2 October in what Saudi Arabia initially claimed was a botched attempt to return him to the Gulf state.

“You are coming back,” a man identified as a former Saudi diplomat and intelligence official, Maher Abdulaziz Mutreb, told the Washington Post columnist after he entered the consulate, according to CNN.

“You can’t do that,” Khashoggi replied. “People are waiting outside,” he said, referring to his fiancee.

Khashoggi was then attacked by several people, CNN’s source said, and could be heard gasping for air.

Jamal Khashoggi death: key figures Show all 7 1 /7 Jamal Khashoggi death: key figures Jamal Khashoggi death: key figures Jamal Khashoggi Washington Post journalist who was critical of the Saudi regime and the young Crown Prince Mohammed bin Salman, he was murdered on 2 October in the Saudi Arabian consulate in Istanbul AFP Jamal Khashoggi death: key figures Saudi Crown Prince Mohammed bin Salman Heir to the Saudi throne, Mohammed bin Salman has been implicated in the murder, with US officials claiming that he must have known of the plot AFP/Getty Jamal Khashoggi death: key figures 15 man hit squad Turkish police suspect these 15 men of being involved in the murder of Jamal Khashoggi, issued 10 October, 8 days after the journalist disappeared EPA Jamal Khashoggi death: key figures Saud al-Qahtani Aide to Crown Prince Mohammed bin Salman, Saud al-Qahtani is claimed to have ordered Khashoggi's murder Saud Al-Qahtani/Twitter Jamal Khashoggi death: key figures Maher Abdulaziz Mutreb A former diplomat who often travelled with the Crown Prince, Mutreb was initially claimed to be the leader of the hit squad and is pictured here entering the Saudi consulate on the day of the murder AP Jamal Khashoggi death: key figures Mustafa al-Madani First implicated in the 15 CCTV photos released by the Turkish police, al-Madani was later found to have been used as a body double for Khashoggi, leaving the Saudi consulate dressed in his clothes on the day the journalist was killed CNN Jamal Khashoggi death: key figures Salah bin Jamal Khashoggi (L) Son of the murdered journalist met with Crown Prince Mohammed bin Salman on 23 October EPA

“I can’t breathe,” he said at least three times. They were his last discernible words.

What follows are more noises, which the transcript records as: “Scream. Scream. Gasping.”

It then describes what can be heard next: “Saw. Cutting.”

A voice identified by Turkish authorities as belonging to Dr Salah Muhammad al-Tubaiqi, the head of forensic medicine at Saudi Arabia’s interior ministry, can reportedly be heard advising those in the room to listen to music as they dismembered Khashoggi’s body.

“Put your headphones in, or listen to music like me.”

Saudi Arabia has not named the 21 suspects it has allegedly detained over the murder.

The transcript then notes that Mr Mutreb made a phone call, saying: “Tell yours, the thing is done, it’s done.” CNN reported its source believes “yours” refers to someone’s boss. Turkish officials said the calls were made to the Saudi capital, Riyadh.

Turkish officials have not said how they obtained a recording of the killing. A transcript of the recording was translated before being shared with other intelligence services. CNN’s source read the translated version.

A Saudi official told CNN: “The relevant Saudi security officials have reviewed the transcript and tape materials through Turkish security channels and nowhere in them is there any reference or indication of a call being made.”

It comes as Saudi Arabia’s foreign minister ruled out the extradition of suspects in the murder after Istanbul’s chief prosecutor filed warrants for the arrest of two former senior Saudi officials.

Turkish officials said last week the prosecutor’s office had concluded there was “strong suspicion” Saud al-Qahtani, a top aide to Saudi Arabia’s crown prince Mohammed bin Salman, and General Ahmed al-Asiri, who served as deputy head of foreign intelligence, were among the planners of Khashoggi’s murder.

“We don’t extradite our citizens,” Saudi foreign minister Adel al-Jubeir said. He was speaking at a news conference at a Gulf Arab summit in Riyadh on Sunday.

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Last month, the US Treasury sanctioned 17 Saudis, including Mr Qahtani but not Mr Asiri, for their role in the murder.