It comes as London members of the "hacktivist" group Anonymous launched Operation Paper Storm, flooding Tube and train carriages with printed copies of US government cables published by WikiLeaks. The group, which launched a cyber attack on Mastercard, Visa, Paypal and Amazon this month in response to their withdrawal of services to WikiLeaks, has extended its online truce until 11 January, when Mr Assange is next due in court over the extradition.