Dozens of attacks across Iraq have killed at least 50 people and wounded about 300.
A second day of violence on April 15 comes just days before an April 20 election, the first since 2010.
The deadliest attacks were in Baghdad where multiple car bombs killed at least 25 people.
Several other cities were also hit, including Fallujah, Tikrit, Samarra and Hilla.
No group has claimed responsibility for the attacks, but Sunni militants linked to Al-Qaeda frequently stage attacks aimed at weakening the Shi'ite-led government.
In the upcoming elections, Iraqis are to choose provincial governing councils.
At least 14 candidates have been killed so far, including one killed in an apparent ambush on April 14.
Authorities have delayed voting in two Sunni-dominated provinces amid security concerns.
Based on reporting by AP and AFP