[David]

AP


Insurgents launched a new salvo of attacks five days ahead of a crucial constitutional referendum, killing at least 12 Iraqis and a U.S. soldier Monday with suicide car bombs, roadside explosives and drive-by shootings, police said.

The latest attacks came as Shiite and Kurdish officials continued to negotiate with Sunni Arab leaders over last-minute additions to the constitution, trying to win Sunni support ahead of Saturday's referendum. U.S. officials were acting as mediators.

But the sides appeared to remain far apart over basic issues ? including the federalism that Shiites and Kurds insist on ? and copies of the draft constitution already are being distributed to the public across the country.

U.S. and Iraqi officials see the referendum as an important step in the country's democratic reforms and the eventual withdrawal of U.S.-led coalition forces.

But many minority Sunnis plan to vote "no," fearing the document would create two oil-rich and nearly autonomous regions ? a Kurdish one in the north and a Shiite one in the south ? and leave most Sunnis isolated in central and western Iraq.

In related developments:


Five mortar shells also were fired at a hotel in the southern city of Hillah where a U.S. regional embassy office is based, with one round hitting the building and leaving a large hole in a wall, police said. No casualties were reported.


Gunmen opened fire on Monday on a convoy carrying members of an Arab League delegation that is visiting Iraq, police said. No casualties were immediately reported in the attack, which occurred as the convoy was driving to a western neighborhood of Baghdad where it was to meet with the Muslim Scholars Association, an Arab Sunni Muslim group, said police Maj. Mousa Abdul-Karem.


On Sunday, militants killed 13 Iraqis, including a Shiite teacher who was dragged out of his classroom and shot to death at a college in the town of Samarra, north of Baghdad.


At least 332 people have been killed across Iraq in the last 15 days, including nine American soldiers who died in a series of offensives the U.S. military has been waging in western Iraq in an attempt to knock al Qaeda militants and other insurgents off balance and prevent attacks during Saturday's national vote on the constitution.


In Monday's worst attack, a suicide car bomb exploded near an Iraqi army checkpoint near a police station in western Baghdad, killing three Iraqi policemen and three civilians, police said. The attack near Al-Nosoor Square also seriously wounded two construction workers at a nearby building site, said police Capt. Qassim Hussein. Teacher Riyadh Qassim heard the blast from his nearby elementary school: "A car bomb exploded. We ran out of school and saw two cars engulfed in flames, one of them a police car. Some of the policemen were in a panic."


Three other suicide car bombs exploded in Baghdad, including one that killed a U.S. soldier at a checkpoint near the capital's highly fortified Green Zone, where Iraq's parliament and the U.S. Embassy are located, the military said. An Iraqi army soldier, an interpreter and an Iraqi civilian also were wounded in the attack, the military said.


Both U.S. and Iraqi army forces were present during the explosion by a car packed with 11 mortar rounds and 60 pounds of explosives, said Sgt. 1st Class David Abrams.


Baghdad's other two suicide car bomb attacks Monday wounded six Iraqis, police said. In Kirkuk, a city 180 miles north of Baghdad, four Iraqi soldiers were killed in two separate roadside bombings, police said. Farther to the north, one Iraqi soldier and one Iraqi policeman died in two separate drive-by shootings in Mosul, officials said.


The fact that many minority Sunnis plan to vote "no" was clear in the northern city of Mosul on Monday when about 600 Sunni politicians, tribal leaders and clerics met and urged Iraqis to reject the constitution, saying it would partition the country along secular lines. "Our rejection of the constitution is motivated by our desire for a united Iraq, not because we are Sunnis," they said in a statement.

Sunni-led insurgent groups have demanded a boycott in the vote and were launching attacks across the country, killing hundreds of Iraqis in the last two weeks.

Sunnis can defeat the charter if they get a two-thirds "no" vote in any three of Iraq's 18 provinces ? and they have the potential to make that threshold in four provinces. But turnout is key, since they must outweigh Shiite and Kurdish populations in some of those areas.

The American death brought to 1,954 the number of U.S. service members who have died since the beginning of the war in 2003, according to an Associated Press count.

In cities, towns and villages across Iraq, 5 million copies of the official text of the constitution were being distributed to voters to consider before the polls.

But all sides were still debating last-minute changes in a bid to swing some Sunnis to a "yes" vote. Kurdish leader Massoud Barzani continued to meet Monday with Sunni Arab leaders to try to convince them about the changes, officials from all sides said.

U.S. Ambassador Zalmay Khalilzad "has a central role in the talks," said Kurdish legislator Mahmoud Othman, but he would not say if the envoy was actually attending the meetings.

U.S. officials could not be reached for comment, but have confirmed in recent weeks that Khalilzad was involved in discussions over last-minute "tweaks" to the charter.

When Iraqi negotiators completed the draft constitution late last month, Sunni Arabs refused to endorse it. Some complained the negotiating process had been rushed under pressure from Washington to stick to the tight timetable that had been set for Iraq's political process.