Polls closed across Turkey on Sunday after millions voted in the country’s one of the most consequential elections pitting President Recep Tayyip Erdogan and his ruling alliance against a coalition of opposition parties led by Kemal Kilicdaroglu to unseat him.

The voting day witnessed high turnout as long lines of people were recorded outside polling stations in main Turkish cities.

Voters who are still waiting at polling stations after closure time will be allowed to vote. Preliminary results will become available in the late evening local time, but the outcome of the presidential elections is not expected to be clear before early Monday as the race marks one of the most contested polls in the country’s history.