Turkish authorities believe Saudi journalist Jamal Khashoggi was killed inside his country's consulate in Istanbul last week, Turkish sources said, in what they described as the deliberate targeting of a prominent critic of the Gulf kingdom's rulers. Khashoggi, a former newspaper editor in Saudi Arabia and adviser to its former head of intelligence, left the country last year saying he feared retribution for his growing criticism of Saudi policy in the Yemen war and its crackdown on dissent.