Labour is projected to win more seats in the House of Commons, an exit poll has predicted.
A BBC/ITV/Sky exit poll predicted 266 seats for Labour, up 34 seats compared with the 2015-2017 Parliament.
The Conservatives were projected to win 314, which would leave them short of a majority.
Shadow chancellor John McDonnell said if the final result matched the exit poll, it would show “positive politics has actually succeeded”.
The NOP/Ipsos MORI poll for BBC/ITV/Sky forecast the Lib Dems on 14, UKIP with no seats and the SNP 34.
It comes at the end of a campaign that has seen leader Jeremy Corbyn address thousands at a series of campaign rallies.
But local candidates reported voters voicing doubts about his leadership on the doorstep.
Speaking to the BBC, shadow chancellor John McDonnell said: “We have to have some scepticism about all polls.”
But he added: “We tried to have an extremely positive campaign. We modelled it around Jeremy’s character.”
In the 2015 general election, Labour won 229 seats under former leader Ed Miliband, down from the 258 seats secured in 2010.
It went into the 2017 election with 232 seats.
When Prime Minister Theresa May announced the election in April, her Conservative Party had a big double-digit lead in many polls and hoped for a landslide victory. However, the campaign saw the Tories’ poll lead narrowing.
Shadow foreign secretary Emily Thornberry told Sky News that exit polls “have been right for the last 20 years or so, 30 years, so I think we’re on the verge of a great result”.
Echoing Theresa May’s election slogan, she added: “We put forward a popular manifesto with a leader of the party who has withstood the most extraordinary personal attacks, and has actually shown if anybody was strong and stable it was him.”
The BBC’s Nick Robinson said few in Mr Corbyn’s team thought the party would win outright – but a result matching the poll would give “enormous power to Jeremy Corbyn, in Parliament and within his party”.
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