Voters in Poland will head to a run-off election on June 1 to choose their next president, early exit polls showed on Sunday.

Initial forecasts put Warsaw Mayor Rafał Trzaskowski, representing Prime Minister Donald Tusk’s centrist Civic Coalition, narrowly ahead with 30.8% of the vote.

Karol Nawrocki, a historian and political outsider running as an independent with backing from the right-wing Law and Justice (PiS) party, received 29.1%.

As neither of them received the necessary absolute majority at the first attempt, a second round of voting is necessary.

Sławomir Mentzen, candidate for the radical right-wing Confederation party, came in third with 15.4%.

According to forecasts, voter turnout was 66.8%.