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Karim Kadim, Associated Press
Civilians inspect the site of a car bomb explosion in the Shiite stronghold of Sadr City, in Baghdad, Iraq, Tuesday, May 13, 2014. A wave of car bombings in mainly Shiite areas of Baghdad killed dozens of people on Tuesday, officials said, the latest in a surge in violence that has been the most serious challenge to the government's efforts to achieve stability across Iraq. The attacks came as Iraqi Shiites were celebrating the birthday of Imam Ali, the cousin and son-in-law of the Prophet Muhammad and Shiite Islam's most sacred martyr.

BAGHDAD — Militants unleashed a wave of car bombings in Iraq on Tuesday, killing at least 34 people and sending thick, black smoke into the Baghdad skies in a show of force meant to intimidate the majority Shiites as they marked what is meant to be a joyous holiday for their sect.

The attacks came nearly two weeks after Iraqis cast ballots in the country's first parliamentary election since the U.S. military withdrawal in 2011. No preliminary results have yet been released, deepening a sense of uncertainty in a country strained by a resurgence of violence.

It was the deadliest day in Iraq since April 28, when militant strikes on polling stations and other targets killed 46. No group immediately claimed responsibility for Tuesday's attacks, most of which hit Baghdad during rush hour, but they were most likely the work of the al-Qaida offshoot known as the Islamic State in Iraq and the Levant.

The militant group, made up of Sunni Muslim extremists, has strengthened control over parts of western Iraq since late December. It seeks to undermine the Shiite Muslim-led government's efforts to maintain security across the country. Coordinated car bomb attacks against Shiites, whom it considers heretics, are one of its favorite tactics.

All of Tuesday's blasts were caused by explosives-laden vehicles parked in public areas. They coincided with the Shiite communities' celebration of the birthday of Imam Ali, the Prophet Muhammad's cousin and son-in-law and the sect's most sacred martyr.

Two blasts hit Baghdad's poor Shiite district of Sadr City, killing six people and wounding 13, according to police. Associated Press journalists on the scene shortly after one of the bombings saw black smoke rising as ambulances rushed to the scene, sirens wailing. Firefighters struggled to extinguish the fire as security forces sealed off the area.

A short while later, a car bomb exploded in a commercial street in the capital's eastern district of Jamila, killing three people and wounding 10. Police said a fourth car bomb went off near a traffic police office in eastern Baghdad, killing four people and wounding seven.

Juice shop owner Haithem Kadhum was rushing home to Sadr City to check on his family after hearing of the attacks when he was struck by the explosion in Jamila. Flying shrapnel struck him in the shoulder.

"I got out of the car and I saw dead and wounded people on the ground. Everybody was in panic," Kadhum said after being treated at a nearby hospital.

Other blasts struck commercial areas in downtown Baghdad, in the eastern districts of Ur and Maamil, and in the southern Dora district. Those attacks together killed 15 and wounded 45, according to police.

Yet another parked car bomb exploded in the afternoon in Balad, a largely Shiite town surrounded by Sunni areas some 80 kilometers (50 miles) north of the capital. That blast killed six and wounded 17, police said.

Medical officials confirmed the casualty figures. All officials spoke on condition of anonymity because they were not authorized to talk to media.

Iraqis went to the polls on April 30 in the first national-level election since American troops left the country. Prime Minister Nouri al-Maliki, who is seeking a third term on a law-and-order platform, hailed the strong turnout as a rejection of terrorism.

It was a theme the British Embassy reiterated in condemning Tuesday's bloodshed.

"Two weeks ago the Iraqi people showed their clear support for a peaceful, democratic process by voting in large numbers. This was a clear rejection of the terrorists seeking to destabilize Iraq," said Britain's charge d'affaires, Mark Bryson-Richardson.

Iraq's Independent Election Commission has said that vote counting is still underway. It has not yet set a date to announce final results.

A coalition led by al-Maliki is expected to win most the seats of the 328-member parliament, but not a majority. He would have to approach other parties to cobble together a coalition to form the next government.

Iraq has seen a spike in violence since April 2013, with the death toll climbing to its highest levels since the worst of the country's sectarian bloodletting in 2006-2008. The U.N. says 8,868 people were killed in 2013, and more than 1,400 people were killed in January and February of this year.


Associated Press writers Sinan Salaheddin and Murtada Faraj in Baghdad and Adam Schreck in Dubai, United Arab Emirates, contributed to this report.