CANBERRA, Australia (AP) – Australia’s ruling conservative coalition won a surprise victory in the country’s general election on Saturday, defying opinion polls that had tipped the centre-left opposition party to oust it from power and promising an end to the revolving door of national leaders.

Opposition Labor Party leader Bill Shorten conceded defeat late in the evening as Prime Minister Scott Morrison’s Liberal Party-led coalition came close to a majority in Australia’s 151-seat House of Representatives, where parties need a majority to form a government. Vote counting was to continue on Sunday.

“It is obvious that Labor will not be able to form the next government and so, in the national interest, a short while ago, I called Scott Morrison to congratulate him,” Shorten told distraught Labor supporters.

The tight race raised the prospect of the coalition forming a minority government. The conservatives became a rare minority government after they dumped Malcolm Turnbull for Morrison in an internal power struggle last August. The government then lost two seats and its single-seat majority as part of the blood-letting that followed.

Pre-election opinion polls had suggested that the coalition would lose its bid for a third three-year term, and that Morrison would have had one of the shortest tenures as Prime Minister in the 118-year history of the Australian federation.

There was so much public confidence of a Labor victory that Australian online bookmaker Sportsbet paid out 1.3 million Australian dollars ($900,000) to bettors who backed Labor two days before the election. Sportsbet said 70 per cent of wagers had been placed on Labor at odds of $1.16.

A rival betting agency said he had accepted a record AU$1 million wager on Labor.

Shorten, who campaigned heavily on reducing greenhouse gas emissions, said Saturday morning that he was confident Labor would win, but Morrison would not be drawn on a prediction.

Morrison is the conservatives’ third prime minister since they were first elected in 2013.

Tony Abbott, who became the first of the three conservative prime ministers in the 2013 election, conceded defeat Saturday in the Sydney seat he has held since 1994.

Polling suggests climate change was a major issue in the seat for voters, who elected an independent candidate, Zali Steggall. As prime minister in 2014, Abbott repealed a carbon tax introduced by a Labor government. Abbott was replaced by Turnbull the next year because of poor opinion polling, but he remained a government lawmaker.

Senior Labor lawmaker Chris Bowen said his party may have suffered from what he conceded was an unusual strategy of pushing a detailed policy agenda through the election campaign.

Morrison began the day Saturday by campaigning in the island state of Tasmania, where the Liberals appeared to have gained two Labor-held seats. He then flew 900 kilometres (560 miles) home to Sydney to vote and to campaign in Sydney seats.

Shorten campaigned hard on more ambitious targets to reduce Australia’s greenhouse gas emissions.

The government has committed Australia to reduce its emissions by 26 per cent to 28 per cent below 2005 levels by 2030. Labor has promised a 45 per cent reduction in the same time frame.

Shorten, a 52-year-old former labour union leader, has also promised a range of reforms, including the government paying all of a patients’ costs for cancer treatment and a reduction of tax breaks for landlords.

Morrison, a 51-year-old former tourism marketer, said he had closed Labor’s lead in opinion polls during the five-week campaign and predicted a close result.

Morrison promises lower taxes and better economic management than Labor.

Both major parties promised that whoever wins the election will remain Prime Minister until he next faces the voters’ judgment. The parties have changed their rules to make the process of lawmakers replacing a prime minister more difficult.

During Labor’s last six years in office, the party replaced Prime Minister Kevin Rudd with his deputy Julia Gillard, then dumped her for Rudd.

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Associated Press writer Trevor Marshallsea in Sydney contributed to this report.