A marathon election count has resumed to determine the balance of power in Ireland's next parliament, with a historic alliance between two age-old foes a potential outcome.

With nearly two-thirds of parliamentary seats filled from Friday's election, the two perennial heavyweights of Irish politics — governing Fine Gael and opposition Fianna Fail — remain neck and neck with 28 seats each.

Electoral officials expect nearly all winners in Ireland's 158-member parliament to be declared by Sunday night.

Fine Gael and Fianna Fail have never shared power in the 94 years since Ireland won independence from Britain. But neither side has ruled out forming a partnership if government stability requires this in Ireland's increasingly fractured political landscape.

The new parliament is scheduled to convene March 10 to elect a prime minister.