Audio linked to Jamal Khashoggi's murder inside Saudi Arabia's Istanbul consulate does not implicate Crown Prince Mohammed bin Salman, US National Security Advisor John Bolton said Tuesday, citing others who have heard the tapes.

Turkey has previously said it shared recordings linked to the murder of Khashoggi -- a Saudi dissident and fierce critic of the crown prince -- with officials in Riyadh, Washington and other capitals. Khashoggi was last seen entering the consulate on October 2 to obtain documents for his forthcoming marriage. After repeated denials, Saudi Arabia finally admitted the 59-year-old had been murdered at the mission in a "rogue" operation. Bolton, speaking to reporters in Singapore ahead of a regional summit, was asked whether it was right to say the audio contained nothing that implicated the crown prince.