Washington ? The FBI is investigating whether an analyst for the Pentagon’s No. 3 official acted as a spy for Israel, giving the Jewish state classified materials about secret White House deliberations on Iran, two federal law enforcement officials said Friday.

No arrests have been made, said the officials, speaking on condition of anonymity because the investigation is continuing. But a third law enforcement official, also speaking anonymously, said an arrest in the case could come as early as next week.

The officials refused to identify the Pentagon employee who is under investigation, but said the person worked in the office of Douglas J. Feith, the undersecretary of defense for policy at the Pentagon.

Feith is a key aide to Defense Secretary Donald H. Rumsfeld, working on sensitive policy issues including U.S. policy toward Iraq and Iran. There are slightly more than a handful of people in Feith’s office who specifically work on Iranian issues.

The investigation centers on whether the employee in Feith’s office passed secrets about Bush administration policy toward Iran to the main pro-Israeli lobbying group in Washington, the American Israel Public Affairs Committee, which then allegedly gave them to the Israeli government, one official said.

Feith also oversaw the Pentagon’s Office of Special Plans, which critics said fed policymakers uncorroborated prewar intelligence on Iraq. Pentagon officials have said the office was a small operation that provided fresh analysis on existing intelligence.

The Pentagon said in a statement that the investigation involves an employee at “the desk officer level, who was not in a position to have significant influence over U.S. policy. Nor could a foreign power be in a position to influence U.S. policy through this individual.”

David Siegel, a spokesman for the Israeli Embassy in Washington, said: “We categorically deny these allegations. They are completely false and outrageous.”