BAGHDAD — A wave of car bomb blasts tore through Shiite areas south of Baghdad on Monday, killing at least 36 and deepening fears that Iraq is rapidly spiraling back out of control.
The attacks capped a week of turmoil that is posing the greatest test of Iraq's stability since U.S. troops left the country in late 2011. At least 218 people have been killed in attacks and battles between gunmen and security forces that began with clashes at a Sunni protest camp in northern Iraq last Tuesday.
The unrest follows four months of widespread protests among Iraq's Sunni minority, who feel they are discriminated against and are being marginalized by Prime Minister Nouri al-Maliki's Shiite-led government.
Iraqi officials fear that Sunni feelings of disenfranchisement could be exploited by extremist groups such as al-Qaida and militant organizations such as the Naqshabandi Army, which is linked to Saddam Hussein's former regime.
In a possible sign of mounting worries over the deteriorating security situation, Iraqi authorities announced they plan to close the country's only border crossing with Jordan, beginning on Tuesday. The Interior Ministry said the move is related Iraq's domestic affairs.
The route to the border runs through the cities of Ramadi and Fallujah, west of Baghdad, which have been hotbeds of Sunni anger at the government. Many Sunnis in western Iraq have economic, tribal and cultural ties with Jordanians, most of whom are also Sunni.
Sheik Fakhir al-Kubaisi, a protest organizer in Anbar province, blasted the latest closure plans as "another escalation by the Iraqi government to punish the revolting Iraqi people." He predicted the closure would drive up the prices of food and medicine, and might be tied to a coming security crackdown on protest sites in the area.
The Interior Ministry spokesman, Lt. Col. Saad Maan Ibrahim, insisted the border closure was solely a technical matter and is unrelated to ongoing tensions in the country. He did not elaborate, and said it should reopen within 48 hours.
Iraq temporarily shut the same border crossing in January, weeks after anti-government protests erupted along the desert highway heading to the checkpoint. That angered many Sunnis in western Iraq, who saw it as collective punishment for their rallies.
The International Crisis Group recently warned that the standoff between Sunni protesters and the central government has begun a dangerous slide toward confrontation.
Monday's deadliest attack struck the southern city of Amarah. Two parked cars loaded with explosives went off simultaneously in the early morning near a gathering of construction workers and a market, killing 18 people and wounding 42, the police said.
That attack was followed by another parked car bombing near a restaurant in the city of Diwaniyah, killing nine people and wounding 23. At least three cars were left charred and twisted from the blast outside a two-story building, and its facade was damaged. Shop owners and cleaners were seen brushing debris off the bloodstained pavement.
Amarah, some 200 miles southeast of Baghdad, and Diwaniyah, 80 miles south of the capital, are heavily Shiite and usually peaceful.
Hours later, yet another car bomb went off in the Shiite holy city of Karbala, killing three civilians and wounding 14, police said. Two early Islamic figures revered by Shiites are buried in the city, about 90 kilometers (55 miles) south of Baghdad.
And in the otherwise predominantly Sunni town of Mahmoudiya, about 20 miles south of Baghdad, a car bomb ripped through a Shiite neighborhood, killing six people and wounding 14, another police officer said.
Ibrahim Ali, a schoolteacher there, was teaching a class when a thunderous boom went off.
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