Europeans from 20 countries are heading to vote on the biggest and final day of voting for the European Parliament.
In a high-stakes election year, the EU vote is particularly significant on a continent that is witnessing rising political polarization and nationalism.
The run-up to the vote was marked by violent incidents. Although the attack, which resulted in Danish Prime Minister Mette Frederiksen receiving a minor flogging and forcing her to suspend her campaign, is not considered politically motivated.
Europe's main centre-right groups are expected to top the EU overall when the first forecasts are released later on Sunday, but all three far-right parties are eyeing a chance to win the most seats nationally.
The French National Union, Italy's Italian Brothers and the Austrian Freedom Party are leading in opinion polls, as is Belgian separatist anti-immigration party Blams Belan.
Most EU member states will vote on Sunday, although some EU countries have already started voting on Thursday, Friday and Saturday. The European Parliament acts as a direct link between Europeans and EU institutions.
