Latest: Erdogan declares victory in Turkey's constitutional referendum despite opposition objections

LATEST: Turkey's president Recep Tayyip Erdogan declared victory in Sunday's referendum that will grant sweeping powers to the presidency, hailing the result as a "historic decision".

Update 10pm: Turkey's president Recep Tayyip Erdogan declared victory in Sunday's referendum that will grant sweeping powers to the presidency, hailing the result as a "historic decision".

Speaking to reporters in Istanbul, Mr Erdogan said unofficial results showed the "yes" side had won by a margin of 1.3 million votes.