At least 350 people have died since October 1, when protesters took to the streets to decry corruption.
Dozens others were wounded in clashes with security forces as protesters burned car tyres on roads and outside many public offices in the southern city of Nasiriyah, some 300 kilometres south of the capital Baghdad.
Demonstrations throughout Iraq intensified on Saturday and Sunday, but protesters are finding themselves being pushed back by clouds of tear gas and a heavy security presence.
The PM's decision came after nine people were killed and dozens others injured as anti-government protests that erupted in the capital Baghdad spread to other city's in the country's south.
Two suicide bombers targeted a restaurant on the road between the northern towns of Tikrit and Baiji, killing three and injuring 34.
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