Polls have opened for the second round of the French presidential election. Centrist Emmanuel Macron stands against anti-immigrant far-right candidate Marine Le Pen. Preliminary results will be announced at 7pm GMT.Tight security is meant to protect the 67,000-odd polling stations from possible terrorist attacks.A day before the election hackers leaked a number of documents from Macrons campaign staff. Election officials warned media to not publish the leaked data to avoid influencing the election.