At least 30 people were killed and 78 wounded in a suicide attack late Thursday inside a Shiite shrine in northern Iraq, police said.
Three attackers stormed the main gate of the shrine of Imam al Sayed Mohammad in Saladin province before blowing themselves up, a local police officer told dpa.
The attack was claimed by Islamic State militants.
The Saladin attack follows a car bombing that killed at least 281 and wounded more than 300 early Sunday in Baghdad, believed to be the deadliest attack in the country since 2003.
Islamic State also claimed responsibility for that attack, which the Sunni group targeted Shiites ahead of the Eid festival that marks the end of the Muslim holy month of Ramadan.
The Islamic State movement considers Shiite Muslims to be heretics.