Ed Miliband is elected leader of the Labour Party

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Ed Miliband: "You have put your trust in me and I am determined to repay that trust"

Ed Miliband is the new Labour leader, it has been announced at a special conference in Manchester.

He beat brother David by the wafer thin margin of 50.65% to 49.35% after second, third and fourth preference votes came into play.

Ed Balls was third, Andy Burnham fourth and Diane Abbott last in the ballot of MPs, members and trade unionists.

Mr Miliband, 40, replaces acting leader Harriet Harman in the contest triggered by the resignation of Gordon Brown.

He paid tribute to each of his fellow candidates in turn and told the conference: "Today we draw a line under this contest and move forward united as a team."

The former energy secretary appears to have benefited from a last-minute surge of support before voting in the postal ballot closed on Wednesday.

Older brother David won a majority of support from Labour's MPs at Westminster and party members, but Ed was ahead among members of trade unions and affiliated organisation in Labour's electoral college voting system.

BBC political editor Nick Robinson said in the first three rounds of voting David Miliband was ahead - it was only when votes were reallocated as the other candidates were knocked out that his younger brother was pushed over the winning line.

Mr Miliband hugged David after the result was announced.

In his victory speech, he vowed to unify the party, telling delegates: "The Labour Party in the future must be a vehicle that doesn't just attract thousands of young people but tens of thousands, hundreds of thousands of young people who see us as their voice in British politics today."

He paid tribute to his predecessors Gordon Brown and Tony Blair, but added: "We lost the election and we lost it badly. My message to the country is this: I know we lost trust, I know we lost touch, I know we need to change.

"Today a new generation has taken charge of Labour, a new generation that understands the call of change."

Mr Miliband received a standing ovation from delegates as he made his way from the hall, with his brother David at his side.

Former minister Tessa Jowell told BBC News David Miliband's defeat will be a "moment of tremendous pain and disappointment" for him. She thinks Ed had a "very particular appeal to young people" and that was what swung it for him.

Mr Miliband, who has been MP for Doncaster North since 2005, is a former aide to Gordon Brown at the Treasury, who joined the Labour Party at the age of 17.

The son of the late Marxist intellectual Ralph Miliband, he is the 20th person to take on the leadership of the Labour Party.

He positioned himself to the left of his brother, the former foreign secretary who is five years older and who started the four-month contest as frontrunner.

He sold himself to party members as the "change" candidate, securing the backing of three of the four biggest trade unions - Unite, Unison and the GMB.

After the result had been declared, his defeated rivals were quick to pledge their support to his leadership.

His former Treasury colleague Ed Balls paid tribute to his "brilliant campaign" adding: "It's a hugely important moment for the Labour Party, now we have got to come together."

He said Mr Miliband had to be given "the time and space to get this right".

Diane Abbott, the most left wing of the five, who gained the most union support in the first round of voting but failed to win the backing of MPs, said Mr Miliband "will make a fantastic leader".

Mr Miliband singled out Ed Balls for praise in his victory speech, leading to instant speculation that the shadow schools secretary could be in line for a top job after next month's shadow cabinet elections.

Conservative Party chairman Baroness Warsi congratulated Mr Miliband on becoming leader of the opposition, but she told BBC News he owed his victory to votes of trade unionists, which she feared would lead to an "abandonment of the centre ground" by Labour.

Under Labour's complex electoral system, voting power is divided equally between three sections: MPs and MEPs, affiliated organisations including trade unions and ordinary party members.

If no single candidate secures 50% or more of the first round vote, the last-placed contender is eliminated and the second preferences of their backers are redistributed.

The elimination process continues until one of the candidates reaches 50% or more, potentially ending, as in this case, as a head-to-head fight between two of them.

After four rounds of voting Ed Miliband won with 175,519 votes, while David Miliband received 147,220 votes.