Greek Prime Minister Kyriakos Mitsotakis flags second election despite landslide poll win for New Democracy party

New Democracy supporters shout slogans outside party headquarters in Athens. (AP: Petros Giannakouris)

Greek voters will have go to the polls again after the ruling New Democracy party scored a landslide election win at the weekend, but still fell short of the seats needed to form a majority government.

Prime Minister Kyriakos Mitsotakis called for a "definitive government solution" after what he called a "political earthquake".