Ireland's opposition party Sinn Féin looked on course to narrowly win the popular vote in the country's general election on Friday, an exit poll suggested, but its two main political rivals— the incumbent coalition parties of Fine Gael and Fianna Fáil— will likely have enough support to retain power.

The Republic of Ireland elects its government using a system of proportional representation known as the single transferable vote. Voters will have the opportunity to rank candidates in their constituency in order of preference, marking their favourite with a number one, a number two beside their next choice and so on.

Counting has begun in the Irish general election, as exit polls suggest a close contest between the three major parties