Greece's ruling New Democracy party stormed to a crushing victory in a parliamentary election on Sunday but fell just short of the threshold needed to form a government on its own, making a runoff election in a month more likely.

With most votes counted, conservative New Democracy took a commanding lead of 40.8% — trouncing the radical leftist Syriza, which governed from 2015 to 2019 and polled 20.1%.

Greece's interior ministry projected New Democracy could win 145 seats in parliament, six short of an absolute majority.