A suicide bomber blew himself up in a Shiite mosque north of Baghdad on Saturday, the deadliest in a series of attacks that left 24 people dead nationwide amid a surge in violence.
The attack struck the Al-Rahman mosque in the predominantly Sunni town of Taji, just north of the capital, at about 8:00 pm (1700 GMT), an interior ministry official and a medical source said.
At least 15 people were killed and 31 others wounded in the explosion, according to the officials.
A suicide car bomb and two separate shootings elsewhere in northern Iraq killed a further nine people.
Iraq has suffered an upsurge in violence since the beginning of the year, coinciding with rising discontent among Sunnis that erupted into protests in late December.
Analysts say a failure by the Shiite-led authorities to address the underlying causes of the demonstrations has given militant groups both a recruitment platform and room to manoeuvre.