A Turkish prosecutor has demanded that arrest warrants be issued against two Saudi nationals close to Crown Prince Mohammed bin Salman over the murder of journalist Jamal Khashoggi, a Turkish source close to the investigation said on Wednesday.

Khashoggi, 59, was killed shortly after entering the Saudi consulate in Istanbul on October 2 to obtain paperwork for his upcoming marriage. The chief prosecutor's office in Istanbul filed an application on Tuesday to obtain the warrants for Ahmad al- Assiri and Saud al-Qahtani, described in court documents as being 'among the planners' of the murder of the Washington Post contributor Khashoggi.