Twenty-five people have been killed and about 52 wounded in suicide attacks against pilgrims in the Iraqi capital, Baghdad, police say. The three attacks, carried out by women, targeted Shia Muslims heading for the Kadhimiya shrine in the north of the city for annual ceremonies. The bombers struck as pilgrim convoys passed through the Karrada district. Meanwhile, a suicide attack in the northern city of Kirkuk has killed at least 11 people, officials say. At least 50 people were injured in the blast, which happened as thousands of Kurdish demonstrators gathered to protest against a controversial law on provincial elections currently going through Iraq's parliament. Sectarian violence Baghdad has been under heavy security because of the Shia pilgrimage. Among those killed in the attacks on pilgrims in the capital were women and children, security and hospital officials told AFP news agency. The BBC's Jim Muir in Baghdad says that major gatherings for Shia religious ceremonies have frequently been the target for bomb attacks, blamed on Sunni extremists. Such attacks were a feature of the cycle of sectarian violence that gripped Iraq last year. The attacks have been greatly reduced by US and Iraqi government forces taking action against Sunni-based insurgents on the one hand, and the Shia militias on the other. More than a million worshippers are expected to attend the pilgrimage But our correspondent says that stopping suicide bombers who move among crowds on foot, especially women wearing voluminous clothing, is particularly difficult. The pilgrimage, which commemorates the death of the revered eighth-century imam Musa al-Kadhim, will reach a climax on Tuesday and more than a million worshippers are expected. The Iraqi military spokesman in Baghdad, Brig Gen Qassim al-Moussawi, told AP news agency that 100,000 Iraqi security forces were being deployed - along with US reinforcements and air support - to protect the ceremonies in Kadhimiya. Security forces are using about 200 women volunteers to search female pilgrims, AP said. Despite the extra security, gunmen also shot dead seven pilgrims in the southern outskirts of Baghdad on Sunday. Some Shia pilgrims said they were determined to continue with the ceremonies. "Today we are going to visit the holy Shrine of Imam Kadhim. We pay no heed to bombings and death. We are believing in God," said Jassim Jihad. In 2005 more than 900 people died in a stampede on the route to the shrine. The panic had been started by rumours of a suicide bomber in the crowd. http://news.bbc.co.uk/2/hi/middle_east/7528117.stm