LONDON (AP) _ Sir Martin Furnival Jones, who headed Britain's MI5 counterintelligence agency during the search for suspected Soviet moles in the 1960s, has died at age 84.

Furnival Jones, who died March 1, led MI5 during the Cold War, when intelligence chiefs lived largely in the shadows, unknown to the public.

During his tenure as director general from 1965 to 1972, the service investigated possible Soviet infiltration of the agency, as well as allegations by Soviet and Czechoslovak defectors that the Soviets had penetrated Prime Minister Harold Wilson's Labor government. No evidence of the latter was found.

The search for a mole in MI5 focused strongly on Furnival Jones' predecessor and friend, Sir Roger Hollis, but no evidence was found that Hollis was a traitor.

In 1963, when Furnival Jones was deputy director, he supervised sensitive operations, including the immunity from prosecution given to Sir Anthony Blunt.

Blunt, a former diplomat and art adviser to Queen Elizabeth II, was identified in 1979 as the ``Fourth Man'' in the famous spy-ring of the 1950s _ Kim Philby, one of history's most successful double agents; Guy Burgess and Donald Maclean.

Born in London, Furnival Jones studied medieval and modern languages and law at Cambridge University, receiving an M.A. in 1938. At the beginning of World War II he joined the army and in 1940 was commissioned to the Intelligence Corps.

He worked in the counterintelligence branch of Supreme Headquarters Allied Expeditionary Force, or SHAEF, where he helped draw up plans to mislead the Germans about the D-Day Normandy landings. For that work he received a Bronze Star from the United States.

Furnival Jones remained with the security service after the war.

``He was a quiet, shy, birdwatching enthusiast who cared for the image of the security service under his leadership, while caring little for his personal image,'' the Times of London said. ``He would not have relished the higher profile attached today to the head of the intelligence and security services.''

Furnival Jones is survived by his wife, Margaret, and one daughter.