The unrest entered its fifth day on Saturday, with at least five people killed in the latest clashes in the capital Baghdad.
The security forces are again reported to have used live rounds.
Demonstrators say they are taking a stand against unemployment, poor public services and corruption.
It is the deadliest unrest since so-called Islamic State was declared defeated in Iraq in 2017.
It is seen as the first major challenge to Prime Minister Adel Abdel Mahdi's fragile government, nearly a year since he came to power.