At least 20 people were killed and 70 wounded in a suicide attack late Thursday inside a Shiite shrine in the northern Iraqi province of Saladin, according to police sources.
There were no immediate details about the attack or the perpetrators.
The Saladin attack follows a car bombing that killed at least 281 and wounded more than 300 early Sunday in the central Baghdad district of Karada - believed to be the deadliest attack in the country since 2003.
The Islamic State extremist group claimed responsibility for the Karada suicide bombing, which the Sunni group said was targeting Shiites ahead of the Eid festival at the end of Ramadan.
The Islamic State movement considers Shiite Muslims to be heretics.