UN's earlier report covering the first wave of protests in Iraq had said a total of 157 protestors were killed and 5,494 others were wounded.
Security forces fired in the air to disperse the protesters who threw stones and burned tires around the building on a street corner in Karbala south of Baghdad.
A government report said almost 150 people were killed in the first week of the unrest in early October, 70% from bullets to the head.
Officials have stopped providing running casualty figures.
Iraq's official human rights watchdog confirmed the deaths.
Amnesty International slammed Iraqi forces days ago for using two types of military-grade tear gas canisters that have pierced protesters' skulls and lungs.
The demonstrations in Iraq, like those in Lebanon and other countries, are fueled by anger at corruption, economic stagnation and poor public services.
But demonstrators have increasingly called for radical reform of the political system, and turned to strikes and sit-ins to press their demands.
Schools and government offices were closed there and across a half-dozen other cities in the south.
Anti-government protesters light candles for the slain protesters in Tahrir Square.
Rights groups have also expressed worry over the detention of protesters, journalists and medics.
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Mr. Abdul-Mahdi on Sunday called on protesters to allow the country to return to normal, without mentioning his offer to resign.
Cyber security NGO NetBlocks said Tuesday that the blackout is "the most severe telecommunication restriction to have been imposed by Iraq's government since protests began" on October 1.
In the predominantly Sunni province of Anbar, which has yet to witness any street protests, authorities detained two men for posting messages of solidarity on Facebook.
On Tuesday, he was in the northern city of Arbil to meet with Kurdish officials as part of talks to ease the crisis.
Embattled Prime Minister Adel Abdel Mahdi proposed a package of measures, including hiring drives and social welfare packages.
"After the first wave of protests, we gave the government until October 25 to enact reforms", a 30-year-old protester, who declined to give his name out of safety concerns, said in Baghdad.
"Tyrants will go but the people will stay", added an elderly protester in a checkered keffiyah scarf.
A spokesman for the prime minister said a group of protesters had crossed the bridge and set fire to a restaurant, and that law enforcement "dealt" with them. "No Iranian will remain in Kerbala or across Iraq".
"They're protecting the Iranian embassy while all we want is a country". This happened because Tehran said that "Tehran was pulling the strings" of Iraqi ruling.
In his weekly Friday sermon in Najaf, Iraq's top Shiite authority, Grand Ayatollah Ali al-Sistani, who was born in Iran and disagrees with Iran's Supreme Leader on religious issues, warned that "no worldwide or regional party" should interfere with the will of the Iraqi people, referring to Iran.
Two government sources said the premier was no longer communicating with President Barham Saleh, seen as his top ally in the absence of his own popular base.
Kerbala hosts the world's largest annual religious pilgrimages, attended by millions of people from Iran, the main regional Shi'ite power.