Iraqi police say at least 21 people have been killed across the country.
Police said on June 22 that 12 people were killed after a suicide bomber blew himself up inside a Shi'ite mosque in Baghdad.
At least 25 others were also injured in the attack in the Sab al-Bor district.
It came after nine people were killed earlier on June 22 in separate attacks that targeted police forces in the country's north.
In Mosul, a suicide bomber set off a car rigged with explosives near a police patrol, killing four people.
In the town of Tuz Khormato gunmen on motorcycles killed three officers.
In Samarra, gunmen targeted a police checkpoint, killing two policemen.
Last month, more than 1,000 people were killed across Iraq in the worst violence the country has seen since a wave of sectarian killings in 2006 and 2007.
Based on reporting by AP and Reuters