New York Pipers Marching towards Ground Zero
Ground Zero Tens of thousands gather in New York to commemorate the dead
Speaking in front of an unblemished stone wall at the Pentagon, which was rebuilt after a hijacked plane knocked out a huge section one year ago, Mr Bush condemned the 19 hijackers as merciless fanatics.
Earlier today tens of thousands of people converged on Ground Zero in New York - where two airliners crashed into the twin towers of the World Trade Centre, causing the greatest loss of life.
Silence was observed at 8.46am local time, the precise moment when the first of two hijacked airliners crashed into the World Trade Centre in New York one year ago.
Pope John Paul called on Christians to pray for the forgiveness of those reponsible for the attacks.
During a ceremony at the Vatican marking the anniversary he roundly condemned terrorism as barbarous and cruel. A prayer read out in Arabic called on believers from all religions to firmly reject all forms of violence.
A minute's silence was observed in many parts of Ireland at 1.46pm this afternoon.
Firefighters from Dublin formed a guard of honour and the Army Number One band played the Irish and American national anthems at the US embassy in Dublin.
The ceremony was attended by the Taoiseach, the Tanaiste and most members of the Cabinet.
Mr Ahern said we must remain relentless in the pursuit of peace and security wherever it is under threat.
At a Mass in the pro-Cathedral this morning, Dublin's auxiliary bishop, Bishop Raymond Field said no grievance or religion could legitimate what had happened on 11 September.
Referring to the prospect of a further US war against Iraq, the bishop quoted Martin Luther King, saying "wars are poor chisels for carving out peaceful tomorrows".
The Deputy US Ambassador, Jane Benton Sort, said the response of Irish people everywhere had shown unshakeable strength.
Several hundred people attended a commemoration in Belfast.
The American Consul in Belfast, Barbara Stevens, led a minute's silence in the Linen Hall Library, which is staging a photographic exhibition to mark the first anniversary of the attacks. Ceremonies were also held in Belfast City hall and at Aldergrove Airport.
