View source for Second bloody sunday

The second Bloody Sunday took place on 30 January 1972 in Derry, Northern Ireland. 13 demonstrators, who were said to be unarmed, protested for civil rights and were shot by soldiers of the British Army. This incident led to an escalation of the Northern Ireland conflict. Three months later a first investigation was carried out under Lord Widgery, which exonerated the British soldiers. It indicated that the demonstrators had started the shooting. In January 1998 Tony Blair announced that another investigation was to be carried out, chaired by Lord Saville. The Saville Report was published on 15 June 2010 and proves that the British soldiers opened fire on the demonstrators. In the name of the British government Prime Minister David Cameron apologised for the violent actions of the British soldiers.

References:

http://www.guardian.co.uk/uk/bloodysunday?INTCMP=SRCH

Pringle, Peter: ''Those are Real Bullets.'' New York: Grove Press, 2000.