No one immediately claimed responsibility for today's blasts but coordinated bombings in civilian areas are a favourite strategy used by al-Qaeda in Iraq.
Since last Tuesday and including the latest deaths, at least 218 people have been killed in attacks and battles between gunmen and security forces that began with clashes at a Sunni protest camp in northern Iraq.
The deadliest attack today was in the southern city of Amarah, where two parked car bombs went off simultaneously in the early morning near a gathering of construction workers and a market, killing 18 people and wounding 42, the police said.
At least three cars were left charred and twisted from the blast outside a two-story building whose facade was damaged in the bombing. Shop owners and cleaners were brushing debris off the bloodstained pavement.
Also Read
Amarah, some 320 kilometres southeast of Baghdad and Diwaniyah, 130 kilometres south of the capital, are heavily Shiite and usually peaceful.
Hours later, yet another car bomb went off in the Shiite city of Karbala, killing three civilians and wounding 14, police said. Two early Islamic figures revered by Shiites are buried in the city, about 90 kilometres south of Baghdad.