Millions of people in up to 60 countries have joined in protests against a possible United States-led war on Iraq.
Protesters have been gathering in New York City and dozens of other US and Canadian cities to join in the global demonstrations.
It is reported up to 100,000 New Yorkers are attending a rally near the United Nations headquarters in Manhattan. Archbishop Desmond Tutu and actors Susan Sarandon and Danny Glover are scheduled to address the rally.
In Dublin, gardaí estimate that at around 100,000 people took part in the demonstration in the city, making it one of the largest marches to be seen in the capital since anti-tax protests over 20 years ago.
While speakers, including Bishop John Kirby of Trócaire and Michael D. Higgins of the Labour Party addressed the crowd, thousands of demonstrators were already lined up along O'Connell Street as far as O'Connell Bridge.
The marchers took two hours to file down O'Connell Street towards the Department of Foreign Affairs on St Stephen's Green.
Among the marchers were a number of Iraqi citizens who said they opposed Saddam Hussein's regime but were also opposed to war on Iraq.
This was one of the biggest demonstrations in the city centre for more than 20 years. Gardaí say the crowd has been good-humoured and they have had no problems.
Protests in London and Rome
In London, over one million people took to the streets of the city to protest against the looming war on Iraq.
The demonstration ended with a mass rally in Hyde Park. Speakers included former Northern Secretary Mo Mowlam, London Mayor Ken Livingstone, pop star Ms Dynamite and the US civil rights campaigner Jesse Jackson.
And up to a million protestors gathered in Rome in one of Europe's biggest anti-war demonstrations as Baghdad's Foreign Minister, Tareq Aziz, prayed for peace at the tomb of St Francis of Assisi.
The march has been seen as a major rebuff to the conservative government of Prime Minister, Silvio Berlusconi, and its backing of the hardline US position on Iraq. The Italian government had pledged to allow the US army use Italy's roads, railways and ports in the build-up to a conflict.
Greek riot police fired tear gas at demonstrators who threw stones and several petrol bombs at them during a rally in Athens, where up to 50,000 demonstrators gathered.