At least 60 deaths have been recorded in anti-government protests that have swept Iraq the past four days, security and medical sources say.
The figure has more than doubled in the past 24 hours, as clashes between protesters and police intensified.
The military said “unidentified snipers” had killed four people in Baghdad, including two police officers.
Prime Minister Adel Abdel Mahdi earlier said protesters’ “legitimate demands” had been heard, but appealed for calm.
Spontaneous protests erupted on Tuesday amid frustration over Iraq’s high youth unemployment rate, its dire public services and chronic corruption.
It is seen as the first major challenge to Prime minister Mahdi’s fragile government, nearly a year since he came to power.
Despite the prime minister’s plea for patience, Iraqis continued to throng the streets in their hundreds on Friday. An indefinite curfew imposed by authorities in the capital, as well as an internet blackout, also failed to prevent protesters from gathering.
According to Reuters, security forces were seen firing live rounds at protesters trying to reach Tahir Square in the capital Baghdad – where much of the unrest has been focused.
several people had been hit by bullets, some in the head and others in the stomach.
At least 60 people have died, including six members of Iraqi security forces. Hundreds more have been wounded.
Much of the violence has been concentrated in Baghdad and majority Shia Muslim areas in the south, including Amara, Diwaniya and Hilla. A number of deaths were reported on Friday in the southern city of Nasiriya, about 320km (200 miles) away.
In his first speech since unrest began, Prime Minister Mahdi vowed early on Friday to respond to protesters’ concerns but warned there was no “magic solution” to Iraq’s problems.
He said he had given his full backing to security forces, insisting they were abiding by “international standards” in dealing with protesters.
Iraq’s most senior Shia cleric, Ayatollah Ali al-Sistani, urged the government to respond to the demands for reform, saying it has “not answered the demands of the people to fight corruption or achieved anything on the ground”.
Meanwhile, Moqtada Sadr – another highly influential Shia cleric who leads the largest opposition bloc in parliament – demanded the Iraqi government resign and call snap elections. Mr Sadr also instructed his lawmakers to pull out of parliament, until the government devises a programme acceptable to the wider public.
The UN and US have expressed concern over the violence, and urged the Iraqi authorities to exercise restraint.
Human rights group Amnesty International has also appealed for the security forces to be reined in.