The UK's vote to leave the EU has sparked demands from far-right parties for referendums in other member states.
France's National Front leader Marine Le Pen said the French must now also have the right to choose. Dutch anti-immigration politician Geert Wilders said the Netherlands deserved a "Nexit" vote while Italy's Northern League said: "Now it's our turn".
The UK voted by 52% to 48% to leave the EU after 43 years. David Cameron has announced he will step down as PM. Global stock markets fell heavily on the news and the value of the pound has also fallen dramatically.
The European Parliament has called a special session for next Tuesday. Analysts say EU politicians will fear a domino effect from Brexit that could threaten the whole organisation.
Le Pen hailed the UK vote, placing a union jack flag on her Twitter page and tweeting: "Victory for freedom. As I've been saying for years, we must now have the same referendum in France and other EU countries."
She is the front-runner among candidates for the presidential election in 2017 but opinion polls suggest she would lose a run-off vote.
The EU worries Brexit could reverse 70 years of European integration.