Millions of Britons are heading to the polls to vote on whether the UK will remain a part of the European Union. A record 46.5 million voters have signed up to weigh in on June 23 referendum that asks: "Should the United Kingdom remain a member of the European Union or leave the European Union?" The divisive referendum has sparked the greatest emergency in the EU's 60-year history.
Al Jazeera: Brexit – Britain votes in divisive EU referendum (VIDEO)
This file photo taken on May 27, 2016 shows The British Union flag (L) and the European Union (EU) flag flying side-by-side outside City Hall, the headquarters of the Greater London Authority, in central London.
