U.S. Officials Grilling Tariq Aziz

Central Command officials were trying Friday to find out what Tariq Aziz (search ), Iraq's former deputy prime minister who was taken into U.S. custody the day before, knows about Saddam Hussein's fallen regime.

The U.S. was optimistic that Aziz's surrender would lead to the capture of more wanted Iraqis, Secretary of Defense Donald Rumsfeld said.

Another Iraqi official, Farouk Hijazi (search), was also captured by U.S. military and intelligence officials in Iraq near the Syrian border. Pentagon sources told Fox News Hijazi was coming out of Syria (search).

A spokesman at Central Command (search) headquarters in Qatar, Lt. Herb Josey, said Aziz surrendered on Thursday. Josey gave no further details.

However, a U.S. official confirmed to Fox News that Aziz did, in fact, turn himself in to U.S. authorities in Baghdad Thursday. The official said the surrender negotiations began Wednesday through a third party who cannot now be identified. 

ABC News reported that Aziz's son was involved in negotiating the surrender.

The talks apparently proceeded swiftly, and Aziz, several U.S. officials say, is now under the coalition's control.

Hijazi was most recently the Iraqi ambassador to Tunisia. U.S. officials told Fox News Hijazi is far more interesting because was once the No. 3 man in the Mukhabarat, Iraq's intelligence service, and was believed to be part of the plot to assassinate former President George H.W. Bush when he visted Kuwait in 1993.

"He would know about that," one official told Fox News.

Hijazi is also suspected of being a contact between the Iraqi government and terrorist groups including Al Qaeda (search). Hijazi wasn't part of the U.S. military's most-wanted leaders deck of cards, but the U.S. administration had accused Syria of offering him safe harbor not long ago.

On the U.S. list of the 55 most-wanted members of the former government, Aziz was No. 43, the eight of spades in the military's card deck of top Iraqi leaders.

His prominence in the regime could make Aziz a source for the best information yet on the fate of Saddam and his two sons, as well as the location of any hidden weapons of mass destruction.

"We can confirm Tariq Aziz is now under coalition control," said Central Command spokeswoman Capt. Dani Burrows.

Aziz was often the public face of Iraq when responding to accusations by the United States and United Nations.

He was the only Christian in Saddam's inner circle, most of whom were Sunni Muslims like Saddam. He served as foreign minister during the 1991 Persian Gulf War and was a frequent spokesman at that time.

Aziz last appeared in public March 19, when he held a news conference in Baghdad to quash rumors he had fled the Iraqi capital.

"I am carrying my pistol to confirm to you that we are ready to fight the aggressors," Aziz said then. "American soldiers are nothing but mercenaries and they will be defeated."

Although he was one of Saddam's most loyal aides, Aziz, like most non-Tikritis, had virtually no power, U.S. officials have said. That could explain his longevity in Saddam's inner circle — without an independent power base, he posed no threat.

In recent years Aziz did not have the international profile he had in the 1990-91 Gulf crisis when, as Iraqi foreign minister, he was virtually "Mr. Iraq" to the world's media.

Saddam promoted him after the Gulf war to deputy prime minister, forcing him to relinquish the foreign ministry portfolio. Some believe this reshuffle had to do with Saddam's not liking a Cabinet minister to become too well known.

Others point to the fact that Saddam's son Odai did not like Aziz. Odai's newspaper, Babil, often criticized foreign policy. In 1996, Aziz's son Ziad was arrested for corruption in what Baghdad insiders saw as a turf battle between Ziad and Odai, who was equally known for graft.

However, Tariq Aziz retained weight within the government. He was Saddam's deputy on the foreign affairs and media committees, in which positions he interpreted Saddam's policies to the ministers concerned. He also conducted the government's negotiations with the U.N. weapons inspectors.

When Saddam fired Aziz's replacement as foreign minister, Mohammed Saeed al-Sahhaf, in 2001, he appointed Aziz as acting foreign minister for four months until Naji Sabri was given the post.

Al-Sahhaf's new post was as Iraq's information minister, which he used during the latest war to denounce the U.S.-led invasion and famously deny that American troops were in Baghdad after they had already captured the capital's international airport.

Born in 1936 near the northern city of Mosul, Aziz studied English literature at Baghdad College of Fine Arts and became a teacher and journalist. He joined the Baath Party in 1957, working closely with Saddam to overthrow British-imposed monarchy.

Aziz changed his name from Mikhail Yuhanna — "Michael John."  In Arabic, Tariq Aziz means "glorious past."

He was wounded in a 1980 assassination attempt by an Iranian-backed Shiite fundamentalist group named ad-Dawa Islami, the Islamic Call. Members of the group threw a grenade at him in downtown Baghdad, killing several people.

The attack was one of several Saddam blamed on Iran, part of his justification for his expulsion of large numbers of Shiite Muslims and his September 1980 invasion of Iran.

Aziz was instrumental in restoring diplomatic relations with the United States in 1984 after a 17-year break. He had met in 1983 with Donald H. Rumsfeld, then a private envoy from President Reagan and now defense secretary. At the time, the United States backed Iraq as a buffer against Iran's Islamic extremism.

The United States broke off diplomatic relations with Saddam's government for good after Iraq invaded Kuwait in 1990, which led to the Persian Gulf War. Aziz was a frequent spokesman for Saddam during that war, too, contending Iraq's invasion of its smaller neighbor was justified.

Fox News' Bret Baier, Ian McCaleb, Jim Angle and The Associated Press contributed to this report.