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The BBC was accused of “bias” after blurring out a musician’s T-shirt bearing the name of Labour leader Jeremy Corbyn.

Electronic group Clean Bandit were among the artists who recorded video messages in solidarity with the victims of the Manchester terror attack to be played during the One Love tribute concert.

The message was broadcast on the BBC as a peak audience of 14.5 million people saw US singer Ariana Grande's emotional return to the city for an event at the Old Trafford cricket ground which attracted 50,000 fans.

The concert was held two weeks after a suicide bomber killed 22 people and injure dozens more at a show by Grande at the Manchester Arena.

In a recorded message, Clean Bandit's singer Grace Chatto wore a white t-shirt featuring the Nike ‘swoosh’ vote and the word ‘Corbyn’.

But some viewers reacted with accusations of bias when Mr Corbyn’s name was blurred out when the message – which was recorded in the run-up to the concert – was broadcast.

One person tweeted: “BBC blurred out Corbyn T shirt at Big Weekend. #BBCBias #CleanBandit #bigweekend #VoteLabour”.

Another added: "The BBC is becoming weaker as the days go by, how embarrassing #CleanBandit #Labour #Corbyn #GeneralElection2017".

All the proceeds from last night’s sell-out concert are going to the We Love Manchester Emergency Fund, which has raised more than £10 million for those affected. A total of £2 million was donated during the three-hour event.

A BBC spokeswoman said: "Our editorial guidelines require us to remain impartial and the UK is currently in an election period, therefore in the context of this programme in order to include Clean Bandit’s message in a montage of well-wishing clips, the t-shirt was blurred."