Iraqi forces have captured a key al-Qaida suspect wanted in the bombing of a Shiite shrine that brought the country to the brink of civil war, the country's national security adviser said Wednesday.

Iraqi border police officers stand guard near the Al-Sheiba oil refinery in the southern Iraq city of Basra, May 24, 2005. The popular refrain in Washington of weaning America off Middle Eastern oil is an unattainable goal that may end up hurting the country in the long run, top oil executives said on Tuesday. [Reuters]

The official identified the arrested man as Yousri Fakher Mohammed Ali, a Tunisian also known as Abu Qudama. The national security chief said Abu Qudama was seriously wounded in a clash with security forces north of Baghdad few days ago. Fifteen other foreign fighters were killed in the confrontation, he said.

Mouwafak al-Rubaie said the ringleader in the operation, an Iraqi he identified as Haitham Sabah Shaker Mohammed al-Badri, was still on the run.

Al-Rubaie said Abu Qudama and al-Badri were in a gang that included two other Iraqis and four Saudis who carried out the attack.

The bombing in February of the Shiite Golden Dome shrine in Samarra, 60 miles north of Baghdad, set in motion a spasm of sectarian killing and revenge attacks on Sunni and Shiite mosques.

The national security adviser said the gang planted bombs in the 1,200-year-old Askariyah mosque that obliterated its glistening golden dome, an addition completed in 1905. While acknowledging al-Badri was still at large, al-Rubaie did not say if the other members of the group had been captured.

He said Abu Qudama, the captured Tunisian, was involved in the killing the of Al-Arabiya TV correspondent Atwar Bahjat, who was shot along with two of her colleagues hours after the shrine bombing.

Abu Qudama entered Iraq in November 2003 and was captured "few days ago" in Udaim, a village about 70 miles north of Baghdad, al-Rubaie said.

"Abu Qudama confessed that he killed hundreds of Iraqis" in different parts of the country al-Rubaie said, but gave no further details.

"Iraqi forces and its intelligence have achieved major penetrations of al-Qaida and other terrorist groups," the national security adviser said.