A roadside bomb exploded near a football playground in Baquba, capital of Diyala province, killing eight people and wounding 18, police said.
An improvised explosive device struck a minibus in Zafaraniyah area in southern Baghdad, killing four people and injuring 15 others.
Meanwhile, in the northwestern province of Nineveh, a bomb attack on an Iraqi army patrol killed four soldiers, police said.
In Tuz-Khurmato, 200 km north of Baghdad, two suicide bombers killed 10 people and wounded 50 others during a rally of the Shia Turkoman minority, police said.
Three Iranian Shia pilgrims were killed and 15 wounded when a roadside bomb struck their bus on a road near Iskandriyah, 50 km south of Baghdad. The pilgrims were on their way from Baghdad to the holy Shia city of Karbala.