NEW : Sinn Fein leader Martin McGuinness says it is `` a good day for Northern Ireland 's '' CNN 's Nic Robertson , Alex Felton and Max Foster and journalist Peter Taggart contributed to this report . Gerry Adams speaks of the need to acknowledge the pain of all victims . Mountbatten lost a relative , Lord Mountbatten , to an IRA bomb in 1979 . The meeting would have been unthinkable 1979 .
NEW : Sinn Fein leader Martin McGuinness says it is `` a good day for Northern Ireland 's '' Gerry Adams speaks of the need to acknowledge the pain of all victims . Mountbatten lost a relative , Lord Mountbatten , to an IRA bomb in 1979 . The meeting would have been unthinkable 1979 .