Early results from Croatia's referendum on proposals to ban same-sex marriages indicate that two-thirds of voters are in favour of the move.
Voters were asked whether they approved changes to Croatia's constitution to define marriage as a union between a man and a woman.
A government spokesperson told the BBC that the early results were based on about a quarter of the ballots.
Large urban centres such as Zagreb and Split have not returned results yet.
On Saturday hundreds of gay rights supporters marched through Zagreb, the capital, in protest at the vote.
A petition backing the referendum, drawn up by a Catholic group, received more than 700,000 signatures.
The referendum asked the question: "Do you agree that marriage is matrimony between a man and a woman?"
If the "Yes" vote is endorsed, Croatia's constitution will be amended to ban gay marriages. Croatia became the 28th member of the European Union in July.
An opinion poll for state broadcaster HRT ahead of the poll suggested that 59% of Croatians were in favour of the "Yes" option, with 31% against.
Almost 90% of Croatia's population of 4.4 million are Roman Catholics and the Church had strongly urged a "Yes" vote.
The vote has also received support from 104 members of Croatia's 151-seat parliament.
The government, human rights groups and prominent public figures have all spoken out against the referendum, urging people to vote no.
Prime Minister Zoran Milanovic argued that the referendum threatened people's right to happiness and choice. But leaders of the opposition HDZ party are behind the referendum.
