Najaf, Iraq ? Car bombs tore through a Najaf funeral procession and Karbala’s main bus station Sunday, killing at least 60 people and wounding more than 120 in the two Shiite holy cities. In Baghdad, gunmen launched a bold ambush, executing three election officials, in their campaign to disrupt next month’s parliamentary ballot.

The deadly strikes highlighted the apparent ability of the insurgents to launch attacks almost at will, despite confident assessments by U.S. military commanders that they had regained the initiative after last month’s campaign against militants in Fallujah.

In the Baghdad attack, dozens of guerrillas — unmasked and apparently unafraid to show their faces — ran rampant over Haifa Street, a main downtown thoroughfare. They dragged the three election workers from a car, lay them on the street in the middle of morning traffic and shot them point-blank.

The bombings in Najaf and Karbala, which Shiite officials suspected were coordinated, were the deadliest attacks since July. They were a bloody reminder that the Shiite heartland in the south — not just the Sunni regions of central and northern Iraq — is vulnerable to the mainly Sunni insurgents aiming to wreck the vote.

Shiites, who make up around 60 percent of Iraq’s population, have been strong supporters of the election, which they expect will reverse the longtime domination of Iraq by the Sunni Arab minority. The insurgency is believed to include many Sunnis who have lost prestige and privilege since Saddam Hussein’s fall.

The persistent insurgent violence has already raised questions over whether residents of central and northern Iraq will be able to vote. If attacks scare away voters in the south as well, it would further undermine the first national ballot since Saddam was ousted.

Warning from Saddam

In a message passed on by lawyers who visited him in his cell last week, Saddam denounced the elections as an American plot.

“President Saddam recommended to the Iraqi people to be careful of this election, which will lead to dividing the Iraqi people and their land,” Ziad al-Khasawneh, who heads Saddam’s legal team, said in Jordan. An Iraqi member of the team met Saddam in detention on Thursday.

The bombings in Najaf and Karbala, predominantly Shiite cities 45 miles from each other south of Baghdad, came just over an hour apart. The first was a suicide blast that ripped through minibuses parked at the entrance to Karbala’s main bus station, followed by a car bomb in a central Najaf square crowded with people watching a funeral procession attended by the city police chief and provincial governor.

The Najaf car bomb detonated in central Maidan Square where a large crowd of people had gathered for the funeral procession of a tribal sheik — about 100 yards from where Gov. Adnan al-Zurufi and Police Chief Ghalib al-Jazaari were standing. They were unhurt.

Hospital officials said 47 people were killed and at least 90 others wounded in the blast, which went off about 400 yards from the Imam Ali Shrine, the holiest Shiite site in Iraq

The blast sheered facades off nearby buildings and brought down part of a two-floor building. Dozens of local men clambered over the rubble, digging for survivors.

Shiites targeted

The Karbala blast destroyed about 10 passenger minibuses and set ablaze five cars outside the crowded Bab Baghdad bus station. Hospital officials said 13 people were killed and 33 injured.

It was Karbala’s second bombing in a week. On Wednesday, a bomb exploded at the city’s gold-domed Imam Hussein Shrine, killing eight people and wounding 40 in an apparent attempt to kill a top aide to Iraq’s most powerful Shiite cleric, Grand Ayatollah Ali al-Sistani.

Also Sunday, insurgents detonated two roadside bombs and a car bomb targeting U.S. forces in the volatile city of Mosul 225 miles northwest of Baghdad, in three separate attacks during a two-hour period. Three soldiers were wounded in one roadside bomb blast, while there were no casualties from the others, according to military spokesman Lt. Col. Paul Hastings.

An official with the leading Shiite political party, the Supreme Council for the Islamic Revolution, said the bombings in Karbala and Najaf Sunday were “no doubt” linked. “These operations aim at driving the Shiites away from the political process and toward acts of revenge to undermine the national unity,” Jalal Eddin al-Sagheer said. “The whole issue has to do with elections.”

Grand Ayatollah Mohammed Said al-Hakim, one of Najaf’s top four Shiite clerics along with al-Sistani, denounced the bombings, saying they aimed to “create a disturbance in security and incite sectarian sedition” and that God will “avenge and compensate” the victims.