An explosion is seen during a car bomb attack at a Shi'ite political organisation's rally in Baghdad, April 25, 2014. A series of explosions killed 18 people at a Shi'ite political organisation's rally in Iraq on Friday, police and medical sources said. The militant group, Asaib Ahl Haq (League of the Righteous), introduced its candidates for elections on April 30 at the rally in eastern Baghdad. Three bombs exploded in succession as people were leaving, Reuters reporters at the scene said. (Photo by Thaier al-Sudani/Reuters)

Men evacuate an injured person after a car bomb attack at a Shi'ite political organisation's rally in Baghdad, April 25, 2014. (Photo by Thaier al-Sudani/Reuters)

A man walks past election posters of Iraqi women candidates in Baghdad, April 24, 2014. As Iraq's general election draws closer, both men and women are vying for seats in the country's parliament. But this year's election, the first one after the withdrawal of U.S troops in 2011, has seen an increase in the number of female candidates. According to an Iraqi election official, women make up around 30 to 35 percent of the candidates in the April 30 election. The total number of nominees in the 2010 parliamentary election was about 690, including 200 or 199 female candidates. As for the upcoming election the number of nominees is 740 to 780, the number of women candidates is 221. (Photo by Thaier al-Sudani/Reuters)

Mourners grieve near the coffin of a fighter of the Shi'ite group Asaib Ahl al-Haq, who was killed in one of Friday's bomb attacks in Baghdad, during a funeral in Najaf April 26, 2014. (Photo by Alaa Al-Marjani/Reuters)

Members of the Shi'ite group Asaib Ahl al-Haq, carry coffins of fighters who were killed in Friday's bomb attacks in Baghdad, during a funeral in Najaf April 26, 2014. (Photo by Alaa Al-Marjani/Reuters)

A traffic policewoman shows her ink-stained fingers after casting her ballot at a polling station, during early voting for the parliamentary election in the northern Iraqi province of Dohuk, April 28, 2014. Iraq will be holding its national elections on April 30. (Photo by Ari Jala/Reuters)

Kurdish security forces wait to vote outside a polling station during early voting for the parliamentary election in Arbil, in Iraq's Kurdistan region, April 28, 2014. (Photo by Azad Lashkari/Reuters)

A member of Kurdish security forces casts her ballot inside a polling station during early voting for the parliamentary election in Arbil, in Iraq's Kurdistan region, April 28, 2014. (Photo by Azad Lashkari/Reuters)

The ink-stained finger of an Iraqi soldier is seen as he holds his rifle during early voting for parliamentary election in Najaf, south of Baghdad, April 28, 2014. Iraq will be holding its national elections on April 30. (Photo by Alaa Al-Marjani/Reuters)