Populist cleric Moqtada al-Sadr convened the march after the U.S. killing of an Iranian general and an Iraqi paramilitary chief in Baghdad this month.
His eventual decision to hold it away from a separate anti-government protest camp, and away from the U.S. embassy, looked pivotal in keeping the march peaceful.
However two protesters were killed and 25 wounded later in a separate protest. Three French nationals and one Iraqi, working for charity SOS Chretiens d’Orient, also went missing in Baghdad, the NGO said.
Throngs started gathering early on Friday at al-Hurriya Square near Baghdad’s main university. They avoided Tahrir Square, symbol of mass protests against Iraq’s ruling elite.
“We want them all out - America, Israel, and the corrupt politicians in government,” said Raed Abu Zahra, a health worker from southern Samawa, who had come by bus to Baghdad and stayed in Sadr City, a sprawling district controlled by Sadr’s followers.