Attacks on Shi'ite targets across Baghdad have killed at least 30 people, just one day after a Shi'ite alliance was officially confirmed as the new power in Iraq.
In the latest attack, a car bomb exploded outside a Shi'ite mosque in the town of Iskandariya, south of Baghdad, killing seven people and wounding 10 others.
Three people, including a child, were killed and five injured in an earlier explosion at a cafe in a Shi'ite district in northwest Baghdad.
20 people were killed in two suicide bombings at Shi'ite mosques in the city earlier, as the Shi'ite community began a religious mourning period.
17 died and 23 were injured when a suicide bomber wearing an explosives belt blew himself up in the Kazimain mosque in the southern district of Dura.
An hour later, two suicide bombers killed at least three people at the Ali al-Baya Shiite mosque in western Baghdad. Nine were injured there.
Thousands of Shi'ite Muslims have been marching through the streets of Baghdad to mark Ashura, one of the most important dates in their religious calendar.
170 people were killed in a series of suicide bombings in Baghdad and Kerbala during Ashura last year.
Shi'ites to dominate Iraq assembly
The bombings come a day after a Shi'ite alliance was confirmed as the victor in Iraq's election last month.
The result secures them power after decades of domination by minority Sunni Muslims.
The next step in the electoral process requires a two-thirds majority in the assembly to approve the appointment of a president and two vice-presidents.
The Shi'ite Alliance and Kurdish bloc are expected to work together to form such a majority. The three-person presidency will then name a prime minister and a cabinet.
The alliance's Ibrahim Jaafari, a doctor with conservative social views, is reported to be front-runner to be prime minister.
Dr Jaafari said the nomination had yet to be decided and that talks on the top jobs would take 'a couple more days'.
Leading figures have said the cabinet should include Sunnis and Mr Jaafari stressed that it was crucial they get involved in drawing up a constitution, which will be the new parliament's main task.
A group led by the present interim Prime Minister, Iyad Allawi, a secular Shi'ite, won 40 seats in the election.
