The MET Alpha team said it reported its findings to Washington after testing the buried material and checking the scientist's identity with experts in the United States. A report was sent to the White House on Friday, experts said.

Military spokesmen at the Pentagon and at Central Command headquarters in Doha, Qatar, said they could not confirm that an Iraqi chemical weapons scientist was providing American forces with new information.

The scientist was found by a team headed by Chief Warrant Officer Richard L. Gonzales, the leader of MET Alpha, one of several teams charged with hunting for unconventional weapons throughout Iraq. Departing from his team's assigned mission, Mr. Gonzales and his team of specialists from the Defense Intelligence Agency tracked down the scientist on Thursday through a series of interviews and increasingly frantic site visits.

While this reporter could not interview the scientist, she was permitted to see him from a distance at the sites where he said that material from the arms program was buried.

Clad in nondescript clothes and a baseball cap, he pointed to several spots in the sand where he said chemical precursors and other weapons material were buried. This reporter also accompanied MET Alpha on the search for him and was permitted to examine a letter written in Arabic that he slipped to American soldiers offering them information about the program and seeking their protection.

Military officials said the scientist told them that four days before President Bush gave Mr. Hussein 48 hours to leave Iraq or face war, Iraqi officials set fire to a warehouse where biological weapons research and development was conducted.

The officials quoted him as saying he had watched several months before the outbreak of the war as Iraqis buried chemical precursors and other sensitive material to conceal and preserve them for future use. The officials said the scientist showed them documents, samples, and other evidence of the program that he claimed to have stolen to prove that the program existed.