Tens of thousands of followers of anti-US Shia cleric Moqtada al-Sadr are protesting in Baghdad against the presence of US troops in Iraq.
The demonstration is being held to mark the sixth anniversary of the city's fall to US troops.
"Down, down USA," the protesters chanted as Ali al-Marwani, a Sadrist official, denounced the US occupation of Iraq that began with the fall of Baghdad on April 9, 2003, and the toppling of Saddam Hussein's statue in Firdos Square.
The crowds of Sadr supporters stretched from the giant Sadr City slum in northeast Baghdad to the square around three miles away.
Demonstrators burned an effigy featuring the face of former US President George W Bush, who ordered the invasion of Iraq, and also the face of Saddam.
Shia Muslims were brutally persecuted under Saddam, who was executed to chants of Sadr's name in 2006.
"God, unite us, return our riches, free the prisoners from the prisons, return sovereignty to our country ... make our country free from the occupier, and prevent the occupier from stealing our oil. God, make us the liberators of our land," al-Sadr said in a message read by an aide.
Hammering home the nationalist message, the aide asked the demonstrators to shake hands with each other and Iraqi police and soldiers overseeing the march.
Long queues formed to kiss the police and troops on the cheeks and shake their hands.
US President Barack Obama has ordered US combat troops to depart Iraq by the end of August 2010, leaving a residual force of up to 50,000 trainers, advisers and logistics personnel.
Under a bilateral security agreement signed with Mr Bush, all US troops must withdraw from Iraq by the end of 2011.
But many at the demonstration did not trust the US to live up to the commitment to withdraw.
Al-Sadr, a member of one of Iraq's great Shia religious dynasties, is believed to be in Iran studying religious law.
His Mehdi Army fighters fought pitched battles against US forces during the bloody aftermath of the invasion, but have since frozen armed operations after al-Sadr called on them to turn themselves into a social welfare organisation.
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