Most of the demonstrators were supporters of Shiite cleric Moqtada Sadr, who has a massive following in Sadr City, the area where at least 64 people were killed in a car bomb blast on Wednesday.
The attack, the worst to hit the Iraqi capital this year, was claimed by the Islamic State jihadist group, but the demonstrators blamed Iraq's political leaders.
"What happened is a reaction by the politicians, because we entered parliament," said Umm Abbas, a 38-year-old woman whose brother was killed in the bombing.
"Politicians threatened us publicly and we thought there would be a campaign of arrests, but it seems they carried out this explosion instead," Umm Abbas said.
"It wasn't Daesh (behind the explosion, it's the politicians," said Abu Ali al-Zaidi, 45, using an Arabic acronym for IS.
He and some of the other demonstrators chanted slogans demanding the resignation of Interior Minister Mohammed al-Ghaban.
Some of the protesters who did not go as far of accusing the government of plotting the bombing nonetheless charged that too little was being done to prevent such attacks.
Two other bombings in Baghdad claimed 30 more lives on Wednesday.
Iraq has thousands of security personnel deployed in the capital, but searches at checkpoints are cursory if they take place at all, and fake bomb detectors are still in widespread use.
A months-old political crisis in Iraq has led to repeated mass demonstrations and has hampered the functioning of the government at a time when the country is battling IS jihadists on several fronts.
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