The order to kill journalist Jamal Khashoggi came from the "highest levels" of the Saudi government, Turkish President Tayyip Erdogan said in an op-ed piece published by the Washington Post on Friday.

Khashoggi, a Washington Post columnist critical of the Saudi government and its de facto ruler Crown Prince Mohammed bin Salman, disappeared after he entered the Saudi consulate in Istanbul exactly one month ago on Oct. 2.

Copyright Reuters, 2018