The curfew affects all vehicles and people on foot
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The Iraqi government has declared an immediate curfew in the capital, Baghdad, to run until Sunday morning.
The move affects both vehicles and pedestrians, a spokesman for the Iraqi prime minister said.
The spokesman did not reveal why a curfew was being put in place, but sectarian violence and blasts have been increasing in recent days.
The brother-in-law of the new chief judge in Saddam Hussein's trial was shot dead in Baghdad late on Thursday.
The curfew order was announced on state broadcaster Iraqiya.
"The government has decided to enforce a curfew on vehicles and individuals starting from Friday evening until 0600 on Sunday morning (0200 GMT)," the message said.
An unidentified official at the interior ministry told the Associated Press news agency that "intelligence information on the security situation" had made the announcement necessary.
'Spike'
US and Iraqi troops have been reinforcing operations against insurgents and sectarian militias in Baghdad.
On Wednesday a US military spokesman said that there had been a spike in violence coinciding with the start of the Muslim holy month of Ramadan, which began on Monday, and that suicide attacks were at record levels.
He also said Iraqi security forces were "making a concerted effort" to end sectarian violence by targeting death squads.
Shortly after he spoke, 10 people were killed and 11 injured in a shoot-out at a Sunni mosque in the capital.
Shia and Sunni militia groups have increasingly been engaged in tit-for-tat attacks on each other since an important Shia shrine in the northern town of Samarra was attacked in February.
A Sunni-led insurgency that erupted after the ousting of Saddam Hussein is also continuing.
On Thursday, gunman ambushed a car carrying Kadhem Abdul Hussein, the brother-in-law of Judge Mohammad Oreibi al-Khalifa, who is presiding over Saddam Hussein's genocide trial.
Mr Abdul Hussein was killed outright and police said his son was injured.
