Security forces say none of the demonstrators were taken into custody, while pro-Iran armed groups blamed by protesters for Friday's killings swore they had no role in the violence.
The anti-Iranian sentiment that has dominated weeks of protests in Iraq might have been a turning point.
Anti-government protesters continue to shut down roads and government offices in the Iraqi capital, escalating a month-long string of rallies demanding political change.
It was not immediately clear who was behind the overnight attack, and protesters said they did not know whether the masked gunmen were riot police, special forces or militias. Around 240 anti-government protester have been killed this month.
Renewed protests began on Thursday evening in a month of deadly unrest that has claimed more than 200 lives.
The United Nations had earlier urged for an end to violence in Iraq, during six days of anti-government rallies marred by the killing of over 100 people, mainly protesters.
Saudi Arabia has failed to devise a long-term strategy in the region while decades of Iranian planning now bears fruit.
The latest heatwave demonstrates that climate change is a transnational threat that requires transcontinental cooperation.
Adel al Kawwaz's family have produced pottery for more than 200 years from clay found at a lake by Najaf, but now, with a flood of more modern products, demand for the handmade clay items has dried up.
Once driving the populist wave during the protests in Iraq, cleric Muqtada al Sadr has now been mandated to resolve the protesters' demands.
An Iraqi man performs a theatrical skit on a street in the southern Iraqi city of Kut every Friday, drawing chuckles, smiles and knowing nods.
In the international media, Iraq is often portrayed between sectarian binaries. The reality is far more simple. Iraqis of all backgrounds suffer from corruption and nepotism, and that, more than anything, unites them.
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