Politicians loyal to al-Sadr threatened to boycott parliament and the Cabinet if al-Maliki went ahead with the meeting. The radical Shiite political bloc, known as Sadrists, is a mainstay of support for al-Maliki, himself a Shi'ite. The Mahdi Army is the organization's armed wing.

Special coverage: Iraq violence continues
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Sadrist lawmaker Qusai Abdul-Wahab blamed US forces for Thursday's attack in Sadr City because they failed to provide security.

"We say occupation forces are fully responsible for these acts, and we call for the withdrawal of occupation forces or setting a timetable for their withdrawal," Abdul-Wahab said.

A US helicopter patrolling above Sadr City came under intense fire from the ground and shot back, wounding two people Friday night, according to police 1st. Lt. Qassim Mohammed and witnesses.

The US military said the helicopter had taken fire from six rockets launched from one site and destroyed the launcher. The military statement did not address whether there were casualties.

White House spokesman Scott Stanzil said the president's plans to meet with al-Maliki on Wednesday and Thursday were unchanged.

Al-Maliki is increasingly at odds with the Bush administration for his refusal to disband militias and associated deaths squads that are believed responsible for killing thousands of Sunnis since an al-Qaida attack blew up the golden dome of a revered Shi'ite shrine on Feb. 22 in Samarra, north of Baghdad.

Mortar fire rained down again on Sunni Islam's holiest shrine in Baghdad, the Abu Hanifa mosque in the Azamiyah neighborhood, wounding at least five people. Several mortars crashed into the area Thursday night within hours of the attacks in Sadr City, one of them puncturing the dome of the shrine and damaging the interior, including its library.

Also, militia gunmen raided a Sunni mosque in the Amil section of west Baghdad, killing two guards, police 1st Lt. Maitham Abdul-Razzaq said.

And in Baqouba, 35 miles northeast of Baghdad, Sunni insurgents blew up the dome of the important Shi'ite mosque of leading cleric Abdul-Karm al-Madani.

In the northern Iraqi city of Tal Afar, 23 people were killed and 43 wounded when explosives hidden in a parked car and in a suicide belt worn by a pedestrian detonated simultaneously outside a car dealership, said police Brig. Khalaf al-Jubouri.

Altogether, 56 people were killed across in Iraq on Friday, and police said they found 31 bodies dumped throughout Baghdad, most of them tortured before being shot.

In Sadr City, cleanup crews continued removing remains of the dead from wreckage of the car bombs, and tents were erected throughout the ramshackle district for relatives to receive condolences.

Hundreds of men, women and children beat their chests, chanted and cried as they walked beside vehicles carrying the caskets of their loved ones toward the holy Shiite city of Najaf for burial. Despite Baghdad's curfew, al-Maliki, himself a Shi'ite, ordered police to guard the processions.

As the funeral processions reached the edge of Sadr City in northeastern Baghdad, the cars and minivans left most of the mourners behind and began the 100-mile drive south to Najaf, a treacherous journey that passes through many checkpoints and areas controlled by Sunni militants in Iraq's so-called "Triangle of Death."

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