A suicide car bomb followed by an assault by grenade-throwing gunmen on a police headquarters in a disputed ethnically mixed city in north Iraq killed 30 people on Sunday.
At least 26 people have been killed and 270 injured in Port Said during riots sparked by a court's sentencing of 21 people to death on charges related to violent clashes between rival football fans last year.
A wave of attacks in and around Baghdad and in northern Iraq killed 17 people and wounded dozens of others on Tuesday, shattering a relative calm after a spate of deadly attacks last week.
Fresh car bomb attacks have left more than a dozen people dead and over 70 other injured across Iraq, local media reported.