BAGHDAD, Iraq — Iraq's national security adviser said today a "huge treasure" of documents and computer records was seized after the raid on terror leader Abu Musab al-Zarqawi's hideout, giving the Iraqi government the upper hand in its fight against al-Qaida in Iraq.

National Security Adviser Mouwafak al-Rubaie also said he believed the security situation in the country would improve enough to allow a large number of U.S.-led forces to leave Iraq by the end of this year, and a majority to depart by the end of next year. "And maybe the last soldier will leave Iraq by mid-2008," he said.

Al-Rubaie said a laptop, flashdrive and other documents were found in the debris after the airstrike that killed the al-Qaida in Iraq leader last week outside Baqouba, and more information has been uncovered in raids of other insurgent hideouts since then.

He called it a "huge treasure ... a huge amount of information."

When asked how he could be sure the information was authentic, al-Rubaie said "there is nothing more authentic than finding a thumbdrive in his pocket."

"We believe that this is the beginning of the end of al-Qaida in Iraq," al-Rubaie said, adding that the documents showed al-Qaida is in "pretty bad shape," politically and in terms of training, weapons and media.

"Now we have the upper hand," he said at a news conference in Baghdad. "We feel that we know their locations, the names of their leaders, their whereabouts, their movements, through the documents we found during the last few days."

American and Iraqi forces have carried out 452 raids since last week's killing of al-Zarqawi, and 104 insurgents were killed during those actions, the U.S. military said today.

Maj. Gen. William Caldwell, a U.S. military spokesman in Baghdad, said the raids were carried out nationwide and led to the discovery of 28 significant arms caches.

He said 255 of the raids were joint operations, while 143 were carried out by Iraqi forces alone. The raids also resulted in the captures of 759 "anti-Iraqi elements."