A regime-critical Saudi journalist who went missing after visiting his country's consulate in Istanbul was 'tortured, murdered and cut to pieces', Turkish police claim.

Jamal Khashoggi, 59, entered the Saudi Arabian consulate in the Turkish capital to obtain official documents for his upcoming wedding, and 'never came back out again'. 

Turkish police believe Khashoggi was murdered inside the building, which Riyadh fiercely denies, instead claiming the journalist disappeared after leaving the consulate on Tuesday afternoon.