Vienna, Apr 18 (EFE).- Up to 2.5 million votes could have been manipulated with during the Turkish constitutional referendum, a number that if revised could reverse the Yes outcome of the vote, warned a Council of Europe electoral observer on Tuesday. <br /><br /> <br /><br />INCLUDES FOOTAGE COURTESY OF ANADOLU. <br /><br /> <br /><br /> Keywords: efe,epa,turkey,referendum,council of europe