Saudi King Salman bin Abdulaziz Al Saud said that Riyadh would hold to account those involved in the murder of journalist Jamal Khashoggi and those who "failed in their duties," the Sky News broadcaster reported on Tuesday.
Jamal Khashoggi, The Washington Post newspaper columnist known for his criticism of Saudi policies, was last seen entering the Saudi consulate in Istanbul on October 2.
On October 19, Saudi Arabia, which initially denied any involvement, admitted that the journalist had been killed in a fight inside the consulate.
Saudi authorities have since detained 18 individuals in connection with the case, and dismissed intelligence chief Ahmad Assiri and Saud al-Qahtani, a senior aid to the crown prince.
Turkey is conducting a separate investigation into the journalist's death.