A predawn explosion Friday at an office belonging to Iraq's major Shiite (search) party killed one Iraqi woman and wounded five others, witnesses said. It was the second attack this week on the Supreme Council for the Islamic Revolution Party (search).

Friday's blast brought down half of the one-story residential building in western Baghdad (search), which also housed a branch office for the party.

Rahim Jabar, who lives in the building, said his sister was killed in the attack and that five other residents were wounded.

Supreme Council members were rushing to the scene.

On Wednesday, senior party member Muhannad al-Hakim (searchwas killed while leaving his home in Baghdad. Party officials blamed the killing on Saddam Hussein loyalists. An anti-Saddam rally was planned for later Friday in the capital.

Al-Hakim was a cousin of Abdel-Aziz al-Hakim, who currently holds the rotating presidency of the U.S.-appointed Iraqi Governing Council. A funeral procession was held Thursday.

In August, Ayatollah Mohammed Baqir al-Hakim, a top Shiite cleric and founder of the Supreme Council party, was killed in a car bombing in the southern city of Najaf that left at least 85 people dead in Najaf. He was a brother of Abdel-Aziz Al-Hakim.