At least 28 people were killed and 74 injured Tuesday in attacks across Iraq, police and security officials said, dpa reported.
Multiple explosions in central Kut, some 180 kilometres south of the capital Baghdad, killed at least 14 people and wounded some 50 others.
Witnesses said that while people were running away from an initial blast, another explosive device went off nearby, causing more deaths and injuries.
Some reports put the death toll in the series of explosions at 30 people, saying that number could further rise as more injured arrived in hospitals.
Kut is a predominately Shiite area.
Earlier, three civilians had been killed and four policemen injured when an explosive device detonated as security forces patrolled the eastern section of the ethnically diverse city of Mosul, located some 400 kilometres north of Baghdad.
Another attack nearby on a police convoy killed four civilians and two policemen and injured 11 others, police sources said.
In Baghdad, meanwhile, five policemen died when unidentified gunmen opened fire on a police checkpoint in the west of the city.
In al-Hurreya, in the northern section of the capital, a car bomb injured another three people, while two bomb blasts in the central neighbourhoods of al-Khilani and Bab Sharqi injured six people.
Iraq had seen a decline in attacks in 2008, following massive military operations against insurgents. In recent months, however, the number of attacks by militants has risen, leading to a particularly high death toll in July.
US President Barack Obama on Monday confirmed that plans to withdraw US combat troops from Iraq by the end of August are on schedule.