Bloody Sunday took place in London on 13 November 1887, when a march against unemployment and coercion in Ireland, as well as demanding the release of MP William O'Brien, was attacked by the Metropolitan Police and the British Army. The demonstration was organised by the Social Democratic Federation and the Irish National League. Violent clashes took place between the police and demonstrators, many "armed with iron bars, knives, pokers and gas pipes". A contemporary report noted that 400 were arrested and 75 persons were badly injured, including many police, two policemen being stabbed and one protester bayonetted.