A series of suicide bomb attacks against Shia Muslims in Baghdad has marred a major pilgrimage to a holy shrine in the city.
Officials said at least 28 people were killed, with dozens more wounded, by three female suicide bombers.
Women are sometimes recruited as bombers because their loose-fitting robes can easily hide explosives. Islamic culture means security forces are often reluctant to stop and search women.
Despite a drop in deadly attacks in the Iraqi capital in recent months, emergency services and ordinary civilians are well used to dealing with the aftermath of a major bombing.
Some of the victims were youngsters, caught up in the attacks as they visited the Musa al-Kadhim shrine.
Tens of thousands of Iraqi security force members are being deployed, along with US reinforcements and air support, to protect the ceremonies in Kadhimiya.
A BBC correspondent says that major gatherings for Shia religious ceremonies have frequently been the target for bomb attacks, blamed on Sunni extremists.
The day had begun with thousands of pilgrims crowding into the mosque for prayers. The commemoration of the Imam al-Kadhim's death in the 8th Century will reach a climax on Tuesday.