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| The campaign has aroused huge passions on both sides |
The outcome of the Labour leadership election between Jeremy Corbyn and Owen Smith will be announced at 11:45 BST.
Mr Smith's challenge to the current Labour leader, who was only elected a year ago, follows months of tension between Mr Corbyn and many Labour MPs.
The Labour leader has offered to "wipe the slate clean" and reach out to his opponents if he is re-elected.
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But amid signs of the continuing tensions in the party, pressure group Campaign Against Anti-Semitism has made a formal complaint to the party about a video posted on Mr Corbyn's campaign website, while 200 members of the party, including three councillors in Bristol, have been suspended.
The two-month campaign has aroused strong passions on both sides and led to legal disputes over the rules and who is entitled to vote. The turnout for the election is expected to be higher than last year, with about 550,000 party members, trade union members and registered supporters eligible to take part.
Mr Corbyn, a veteran left-wing MP who went from rank outsider to be elected leader with 59.5% of the vote last year, is the strong favourite to win. He has stressed his commitment to far-reaching economic and political change and insisted he wants to lead Labour back into power and is not content with opposition.
In a video posted on twitter on Friday night, Mr Corbyn said the party had "a duty to unite, cherish and build our movement" whatever the result of the leadership poll.
He described the campaign as "robust and at times difficult" but said it had been "overwhelmingly respectful in tone".
Mr Corbyn also said his campaign team had created new networks that would be a "pivotal part" of Labour's general election campaign, which he said would be the party's "biggest, best and most visible".