Warsaw, Jul 17 (IANS): Poland's main opposition group Civic Coalition and the campaign of losing candidate, Warsaw Mayor Rafal Trzaskowski, have filed complaints at the Supreme Court about the results of the presidential election.

The complaints contained hundreds of incidents that, according to the opposition, have given the winner, incumbent President Andrzej Duda, an unfair advantage, Xinhua news agency reported.

Duda won the run-off election Sunday by a slender margin, gaining 51.03 per cent of the vote over Trzaskowski's 48.97 per cent.

The main complaints concerned what the opposition said unfair involvement of state institutions in the campaign.

"These elections were not fair, because fair elections mean equal treatment of candidates," Barbara Nowacka, a Civic Coalition MP, said at a press conference on Thursday.

The Civic Coalition is made up of the main opposition party Civic Platform and several minor parties.

The Supreme Court has 21 days to review all the protests and rule whether any of them undermines the validity of the election.

Observing body of the Organization for Security and Co-operation in Europe has said the voting was organized professionally on the whole.

Sunday's official turnout stood at 68.12 per cent, which is 0.08 percentage point short of the record set in 1995, according to the National Electoral Commission.

Exit polls had indicated 62.9 per cent of voters cast their ballots in the first round of polls on June 28, up from 49 per cent five years earlier.

The presidential election, originally planned for May 10, was postponed due to the COVID-19 pandemic and the resulting lockdown.

To date, Poland has a total of 39,054 COVID-19 infections, with 1,605 deaths.