BAGHDAD - Iraqi police say a female suicide bomber has detonated an explosive vest among a group of pilgrims worshipping at a Shiite shrine in Baghdad, killing at least 30 people.

Police say the bomber blew herself up near the shrine of Imam Mousa al-Kazim, one of the holiest men in Shiite Islam.

They say at least 50 are wounded and that a number of Iranian pilgrims are among the casualties.

Police were speaking on condition of anonymity as they were not authorized to release information to the media.

Sunday's attack comes as Shiites prepare to mark Ashura, one of the most important holy days for Shiite Muslims.

Ashura, which falls on Jan. 7, marks the death of Islam's Prophet Muhammad's grandson Imam Hussein.