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Poland's incumbent President Andrzej Duda holds a slim lead after Sunday's presidential election, according to three exit polls.

A final exit poll on Monday showed Mr Duda, an ally of the conservative government, with 51% of the vote, BBC News reported. 

He was pitted against the socially liberal Warsaw mayor Rafal Trzaskowski.

The vote has been widely seen as a battle for the country's future as well as its strained relations with the European Union.

Mr Trzaskowski received 49.6% of the vote, according to the first exit poll, which pollster Ipsos said had a margin of error of two percentage points.

But two further polls have shown a wider margin between the pair.

A second poll - combining exit poll data with partial official results - suggested Mr Duda received 50.8% of the vote, while a third showed 51% percent, with a margin of error of one percentage point.

Official results are expected later on Monday. It looks set to be the closest presidential election in Poland since the fall of communism in 1989, the BBC's Warsaw correspondent Adam Easton reports.

"I want to thank everyone that voted for me," Mr Duda said shortly after the first exit poll was announced.

Mr Trzaskowski told his supporters: "The result has probably never been so close in Polish history, we've never felt the power in our vote so much."

Mr Duda said turnout was nearly 70%, which, if confirmed by election officials, would be a record high for a presidential election in the country.