BAGHDAD  — A wave of suicide and car bomb attacks in Iraq killed at least 29 people and wounded dozens more on Thursday, May 22, officials said.

No group immediately claimed responsibility for the attacks, which mainly targeted Shi’a pilgrims, but they bore the hallmarks of Islamist extremists. The pilgrims were on their way to the shrine of Imam Mousa al-Kazim, a revered saint who lived in the eighth century, to commemorate the anniversary of his death, which falls on Sunday this year.

Such events draw hundreds of thousands of pilgrims and are often targeted by militants.

Thursday’s deadliest attack took place in Baghdad’s eastern Ur neighborhood when a parked car bomb went off near a group of pilgrims, killing at least 10 and wounding 25 others, a police officer said, adding that the dead included seven children under 14 years of age.

Another parked car bomb exploded in the capital’s western Mansour neighborhood, killing nine and wounding 26 others, another police officer said.

In central Baghdad, a suicide car bomber targeted another group of pilgrims, killing five and wounding 18. Another suicide car bomber drove his explosives-laden car into a checkpoint in the town of Mishahda, killing three policemen and two civilians while wounding 11 others, a police officer said. The town is located 30 kilometers (20 miles) north of Baghdad.

Medical officials confirmed the casualty figures. All officials spoke on condition of anonymity as they were not authorized to release information.