NAJAF, Iraq -- Iraqi authorities arrested more than 50 suspects Monday in twin bombings that killed dozens of civilians in Shiite Muslim holy cities and inflamed sectarian tensions.

The escalating violence appears to be intended to cripple nationwide elections scheduled for Jan. 30 and aggravate the long-standing tensions between Iraq's majority Shiites and the Sunni minority that ruled the country under Saddam Hussein.

The bombings Sunday in Najaf and Karbala, home to shrines of the two most venerated Shiite saints, killed 67 people and wounded more than 100. The attacks also were evidence that insurgents have survived the American-led offensives against the rebel strongholds of Fallujah and Samarra and the Sunni Muslim villages in the so-called "triangle of death" just south of Baghdad.

In Najaf, where a bomb ripped through a public square and narrowly missed the governor and police chief, tensions were high Monday as thousands turned out for the first day of burying the victims of the blast. Shops and public offices were closed, and angry relatives of the wounded packed the main hospital.

In a new attack in Karbala on Monday, a bomb exploded at a police checkpoint, damaging nearby buildings but inflicting no casualties. Police said they arrested the attacker.

The electoral commission, meanwhile, pushed ahead Monday with preparations for the vote. Ashraf Qazi, the U.N. special representative for Iraq, opened a ceremony in Baghdad in which numbered balls were pulled from a rolling barrel, much like a lottery drawing, to decide the order in which the 256 political parties and coalitions would appear on the ballot.

Also Monday, a roadside bomb near Baghdad's airport destroyed a U.S. Army Humvee, the military said. One soldier was reported wounded. Three soldiers were wounded when a 1st Infantry Division patrol was ambushed near Balad, north of Baghdad, a U.S. military statement said.

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