Attacks in Iraq on June 24 have killed more than 40 people.
Baghdad was worst hit as ten car bombs exploded across the capital, leaving 39 dead.
Some of the attacks in Baghdad targeted districts where Shi'a were commemorating the anniversary of the birth of a revered Imam.
Others, however, occurred in mixed neighborhoods or mainly Sunni districts.
Elsewhere, five people were killed when a bomb exploded outside a cafe in the northern city of Mosul.
The attacks were the latest in a wave of violence that has claimed more than 2,000 lives since the beginning of April, making it the deadliest period in the country since 2008.
Interior Ministry spokesman Saad Maan Ibrahim said that Al-Qaeda is avoiding direct confrontation with the security forces and instead are choosing civilian targets.
Militants, building on Sunni discontent with the Shiite-led government, appear to have grown stronger in central and northern Iraq.
Based on reporting by dpa, AP, and Reuters