I guess some people thought that Iran would be on our side considering their 8-year war with Iraq and their hatred for Saddam Hussein. Well, apparently, give the choice between Saddam and George W Bush, they would happily take the side of Saddam.
Huge anti-war march in Iran
Huge anti-war march in Iran
The BBC's Miranda Eeles, who is in Tehran, said thousands of Iranians chanted anti-American slogans and carried banners saying "Bush is the new Hitler", as they made their way towards Revolution Square.
Demonstrators burnt US and British flags, and threw stones at the British embassy, smashing its windows.
Thousands of anti-war protesters also took to the streets in cities across Jordan, with some chanting support for Syrian leader Bashar al-Assad, who has strongly opposed the war.
In an interview with a Lebanese newspaper, Mr al-Assad said he hoped the US-led coalition would not succeed in defeating Iraq, and warned that Syria might be America's next target.
There have also been large anti-war protests in other parts of the world, particularly in South Asia, following Muslim Friday prayers.