Saudi Arabia's Crown Prince Mohammed bin Salman has called the son of Jamal Khashoggi, the journalist who was killed at the Saudi Consulate in Istanbul by officials that allegedly included a member of the royal's entourage.

King Salman too called Khashoggi's son, Salah, the state-run Saudi Press Agency reported on Monday. According to the press statements, both King Salman and the crown prince "expressed condolences".

Khashoggi was killed on Oct 2 at the consulate, where he had gone to get paperwork to be married.

For weeks, Saudi Arabia had been insisted that The Washington Post contributor had left the consulate. The kingdom finally acknowledged his death early on Saturday in what it described as a "fistfight".

Turkish media quotes officials as saying that a team of 15 Saudis cut off Khashoggi's fingers, killed him and dismembered his body.