Prime Minister Mustafa al-Kadhimi held an urgent meeting with top security commanders to discuss the Daesh-claimed attack, in Iraq's Sadr city east of the capital Baghdad.
Iraqi police say a parked car exploded at a market in the mainly Shia Muslim district of the capital city, killing at least four people and injuring 17 others.
Protesters retook control of half of Ahrar Bridge, which leads to the other side of the Tigris River near the heavily fortified Green Zone, the seat of Iraq’s government.
The most recent protests differ radically in their demands and the harsh government response has raised the stak.
Iraqi security officials say another 30 people were wounded in the blast that hit Imam Mahdi al Muntadhar Mosque in Baladiyat neighbourhood, near the densely-populated district of Sadr City.
"A suicide bomber wearing an explosive belt blew himself up close to stalls at the crowded Jamila market," said a senior police officer, who asked not to be named.
The Independent High Electoral Commission said on Sunday that Muqtada al Sadr's coalition was leading in Iraq's parliamentary election with over half of the votes counted. Full results are expected to be officially announced on Monday.
A car bomb exploded near a busy Baghdad marketplace, killing at least 11 people and wounding another 26. Iraqi security forces were among the victims, medics say.
The second car bomb attack in a week wounded 30 others and damaged several shops. It comes as US-backed Iraqi forces are closing in on the Daesh-held western half of Mosul.
At least 51 people died in the attack claimed by Daesh which comes a day after another blast killed and injured dozens in the Sadr City district of Baghdad.
A suicide bomber has blown up a truck full of explosives in the heavily populated Shiite-majority suburb of Sadr City.
Thursday's attack followed Monday's deadly car bombing that was claimed by Daesh in which 24 people were killed in the Sadr City district.
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