The Iraqi government announced the arrests of several suspected insurgent leaders Monday, including one man they say has claimed responsibility for 32 car bomb attacks since March 2003.

"Abu Umar al-Kurdi claims responsibility for some of the most ruthless attacks on Iraqi police forces and police stations," said al-Naqib, who said al-Kurdi was responsible for 75 percent of the bombs used in Baghdad attacks in the past two years, including attacks on the Jordanian embassy and the United Nations compound in August 2003.

He also claimed responsibility for a blast that killed Shia religious leader Ayatollah Bakir al-Hakim and more than 100 others at the holy Imam Ali Mosque in Najaf in the same month, al-Naqib said.