The deadliest attack happened in Samarra, north of Baghdad, where a car bomb detonated near a mosque in the city's center. The explosion was followed by clashes between gunmen and Iraqi security forces, according to Samarra police.
At least 18 were killed -- 10 civilians and eight security officers -- and 37 were wounded in the blast and gunfight in Samarra, police said.
Insurgents on Sunday also bombed a minibus in Baghdad as it carried pilgrims to one of Shiite Islam's holiest shrines, killing at least six and wounding nine others -- including women and children -- Iraqi officials said.
It was unclear where the bomb was placed. An Iraqi Interior Ministry official said the device was planted on the bus heading to the Imam Musa al-Kadhim shrine in Baghdad's Kadhimiya district. But the Ministry of Defense said car bomb parked near the bus was behind the blast.
Sunday is the second day of Eid al-Fitr for Shiites, the feast marking the end of fasting during the holy month of Ramadan.
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