The US military had initially said more than 40 civilians had been killed in the Sunday explosion in the Mashtal area of eastern Baghdad. This figure was not reconfirmed later.
The attack occurred at the Rashad police station during a blinding sandstorm. Security barricades prevented the bomber from reaching the station, but the huge blast destroyed two dozen cars and damaged nearby shops.
Body parts were strewn across a large area at the explosion site, Iraqi journalist Walid Khalid told Aljazeera. Many of the victims were charred beyond recognition.
One US soldier was killed and two were wounded on Sunday during a mortar attack near Balad north of Baghdad, the US military said.
Elsewhere, armed men killed the head of the city council in
Samarra, 95km north of Baghdad, police said.
Council chairman Taha al-Hinderah and a companion were gunned down as they walked in the Albu Rahman neighbourhood on Sunday evening, said police Captain Laith Muhammad.
The Baghdad blast occurred
during a sandstorm
In Mosul, anti-US fighters emptied fuel from two tankers on the Muthanna Bridge across the Tigris river and set in on fire, police said. Two people were wounded in clashes that followed.
Six policemen were also killed on Sunday in scattered attacks
in Baghdad and Kirkuk, officials reported. Armed men in Kirkuk
also killed an Iraqi soldier and wounded six people, police
Ayham al-Samaraei, a member of the Iraqi constitution drafting committee, said the Sunni Arab members would most likely resume their participation in the constitution drafting committee on Monday, pointing out that most of their demands have been met.
Speaking to Aljazeera, al-Samaraei, of the Islamic Party, said the Sunni Arab boycott was not due to the provisions of the constitution, but the circumstances that accompanied its drafting.
He renewed the call to review the provisions dealing with the federal system, which could be "understandable when talking about Kurdistan, but remain ambiguous when talking about other regions".
Allawi bloc warning
Meanwhile, members of former prime minister Iyad Allawi's bloc have threatened to walk out of the constitutional drafting committee in support of a Sunni group that has boycotted the process.
Committee member Adnan al-Janabi, who is also part of secular leader Allawi's eight-member bloc, criticised the way the commission dealt with the Sunni members' decision to suspend their participation in drafting the new charter.
Ex-premier Allawi's bloc said it
was not consulted on the draft
The committee is dominated by Kurds and religious Shia parties.
"Their demands and suspension of membership should have been studied and taken in a way that reassures them and brings them to participate in the draft constitution that we want to be agreed upon by all Iraqis," he said.
On Sunday, no Sunni members showed up at a planned constitutional meeting, though the group had indicated a day earlier that it was considering a return.
Shia member Baha al-Araji said no decision would be taken "without the presence of the brothers unless there is a reason for the absence. Therefore, the committee will be committed to handing over the draft at the time agreed upon".
The threatened walkout by Allawi's group is the latest hurdle in the commission's goal of getting a constitution drafted and approved by the assembly on 15 August. That charter would then be scheduled for a public referendum two months later.
"Their demands and suspension of membership should have been studied and taken in a way that reassures them..."
Allawi bloc member
The mixed make-up of the committee was deemed crucial for drafting a constitution acceptable to all of Iraq's ethnic and religious communities.
On Thursday, the 12 remaining Sunni members of the commission suspended their participation to protest against the assassination of Sunni member Mijbil Isa and adviser Dhamim Husayn al-Ubaidi by unknown armed men. Two of the original 15 Sunni members had resigned earlier over threats against them.
They had demanded an international investigation into the killings, better security and a greater Sunni role in deliberations.