Thousands of protesters gathered in central Baghdad’s Tahrir square on Friday, as Iraqi forces imposed tight security measures around an area that saw deadly clashes last week.
Demonstrators loyal to prominent Shia cleric Moqtada al-Sadr, are demanding a revamp of the electoral system.
Police and army forces closed roads and bridges around the area and searched anyone getting inside the square.
Last Saturday, five people were killed and more than 300 injured when security forces used force to disperse the pro-reform rally.
Friday’s protest comes one day after a car bombing in Baghdad claimed by the radical Sunni Islamic State militia killed 45 people in Baghdad, the deadliest attack this year.
The Iraqi government is engaged in a US-backed military campaign to recapture Mosul, Daesh's key stronghold in the northern part of the country, which the group seized in mid-2014.
Iraqi forces last month regained Mosul's eastern section, and are preparing for a new offensive aimed at wresting the western part of the city from Islamic State control.
