Latest: Three die in fight outside Turkey polling station

Latest: The death toll in a fight outside a polling station in Turkey has risen to three as voters cast their ballots in a historic referendum on expanding the president's powers.

Update 2.50pm: The death toll in a fight outside a polling station in Turkey has risen to three as voters cast their ballots in a historic referendum on expanding the president's powers.

Earlier: Two people have died in a fight outside a polling station in Turkey as voters go to the polls in a historic referendum on reforms that would concentrate power in the hands of the president.