Three more people have died in renewed anti-government protests across Iraq, Reuters reports citing police and hospital sources.

The protestors died after they were struck in the head by tear gas canisters shot by security forces. 84 other people were injured at a protest in Tahrir Square in the capital, Baghdad.

Demonstrators had gathered in Tahrir Square in Baghdad on Saturday morning braving attempts by riot police to disperse them using tear gas.

At least 40 people died on Friday in violent protests across the country where some people burnt government buildings or offices belonging to factions of Hashed al-Shaabi.

On Friday night, 12 people were killed in Diwaniyah as they burnt the headquarters of the Badr organisation.

Iraq was rocked by demonstrations in early October, first denouncing corruption and unemployment before evolving into calls for an overhaul of the political system.

More than 200 people have died and thousands of others have been wounded in Baghdad and across the country's Shiite-majority south since the protests began.

Despite authorities recently imposing curfews across most of Iraq's southern provinces and a strong response by security forces, pockets of protests were staged in Diwaniyah, Nasiriyah, Babylon and Najaf.

Prime Minister Adel Abdul Mahdi has pledged reforms and even ordered a broad cabinet reshuffle but has, thus far, not managed to address the protesters' dissatisfaction.