The FBI has learned that an Iraqi spy passed Pentagon information about plans for a U.S. military attack to a senior intelligence official in Baghdad, The Washington Times reported Tuesday.

The paper said the FBI began investigating shortly after officials learned that the Iraqis were informed by "a U.S. person" in late January that a much-anticipated strike could take place within two weeks and involve large-scale attacks by so-called "smart" bombs and missiles.Citing intelligence officials speaking on condition of anonymity, the Times said the spy search began in early February when U.S. agencies learned that the agent, whose last name is known to the FBI, tipped off a senior member of the Iraqi intelligence service about U.S. military planning.

The sources told the paper the spy told Iraq the attack would last five days and that information about the attack was obtained from a source in Washington who regularly receives information from the Pentagon.

The paper quoted one official as saying the FBI probe so far is limited to a counterintelligence matter involving Iraqi activities in the United States and has not evolved yet into a criminal spy case.

Officials told the paper it is not known at this point whether sensitive U.S. national security information was passed to the Iraqis, noting that a good deal of general information about U.S. military plans was appearing in the media beginning in January.

It said FBI officials and the CIA's Counterintelligence Center were told about the matter on Feb. 2, but that other details of the investigation could not be learned.