Irish voters are heading to the polls in a second referendum on the EU's Lisbon Treaty - a vote that may decide the future of long-delayed EU changes.
They previously rejected the treaty in a June 2008 referendum, by a margin of almost 7%. This time opinion polls suggest the Yes camp will win.
The Republic of Ireland is the only one of the EU's 27 member states to put the treaty to a referendum.
Ireland's economy has been hit hard by recession since the last vote was held.
The treaty, aimed at streamlining decision-making in the enlarged bloc, cannot take effect unless all the member states ratify it.