Ulster Unionist Party says it acknowledges the pain felt by families . Last year , Prime Minister David Cameron described what happened in Londonderry as `` unjustified and unjustifiable , '' following the release by the British government of a damning report that reversed decades of official explanations for the 1972 killings . pro-British troops shot dead Thirteen people and a 14th later died of his injuries . A report last year found that British soldiers were to blame in the massacre . Bloody last year is widely accepted as having fueled violence in Northern Ireland .
Ulster Unionist Party says it acknowledges the pain felt by families . pro-British troops shot dead Thirteen people and a 14th later died of his injuries . A report last year found that British soldiers were to blame in the massacre . Bloody last year is widely accepted as having fueled violence in Northern Ireland .