FILE - A detachment of the Queen's Household Cavalry lay dead, victims of a concealed car bomb detonated in Carriage Road, in London's Hyde Park, in this July 20, 1982 file photo. A 61-year-old Irishman was charged in Britain Wednesday, May 22, 2013 with the Irish Republican Army bombing of the queen's ceremonial cavalry in Hyde Park in 1982, a strike at a top London tourist attraction that killed four soldiers and seven horses. The leader of Northern Ireland’s unity government has threatened to resign because of revelations that the British government has supplied so-called ``get out of jail free’’ letters to Irish Republican Army fugitives from justice. First Minister Peter Robinson said Wednesday, Feb. 26, 2014, his British Protestant party would never have formed a coalition with Sinn Fein, the IRA-linked party, in 2007 had Britain revealed it was giving written guarantees to IRA veterans who fled to the Republic of Ireland.(AP Photo/Peter Kemp, File)