This is an entry from: LIVE: Turkey votes on whether to expand president's powers
'Yes' votes dip to 51.8% nationwide: Local media
16 April 2017 17:26 BST
According to local media, the number of 'Yes' votes has dipped to 51.8% with 92 percent of the ballot boxes now opened.
Analysts have said that a 'No' vote in Istanbul would be a big blow to the ruling Justice and Development Party (AKP).