Washington ? The CIA is increasing its presence at FBI field offices by assigning intelligence officers to domestic anti-terrorism teams, officials said Wednesday.

The goal is to have at least one CIA officer at each of the 56 FBI field offices in the United States, a U.S. intelligence official said. The officers are being drawn from both the agency’s analytical and operational branches.

They serve as conduits of information, providing the FBI and local police distilled intelligence that the CIA and other services have collected overseas, officials said. At the same time, information gathered by local law enforcement on potential terrorist activities is sent to CIA headquarters.

“This increased cooperation is crucial in the fight against terrorism, and the role of the agency is to provide intelligence information to law enforcement authorities,” said CIA spokesman Mark Mansfield.

The practice, which started on a small scale before Sept. 11, follows an FBI effort to station more of its agents on CIA territory: overseas. For several years, the FBI has assigning agents as legal attaches to U.S. embassies, the traditional home of clandestine CIA officers.

The CIA officers at the FBI field offices will not be employed in the field, officials said.

As a foreign intelligence agency, the CIA has been severely restricted in what it can do inside the United States since the mid-1970s, when Congress enacted reforms to prevent the agency from spying on Americans.