Coldplay and Mumford and Sons were among the performers last weekend at an Amnesty International concert organised in defence of freedom of expression.

The show marked the first time that the Secret Policeman’s Ball – organised by Amnesty International since 1976 – was held in the US.

Television comedian John Stewart was among the performers, sharing the stage with a fake Kim Jong-Un, who wanted to dominate the stage at all cost.

US actor Ben Stiller and Briton David Williams had fun comparing the meaning of different English words on both sides of the Atlantic.

Other participants included Russell Brand, Jimmy Carr, Sarah Silverman or Reggie Watts, whose performances were funny and often politically incorrect.