A U.S magazine says a former assistant director of the FBI claims he was the crucial source of information for newspaper reports exposing the Watergate scandal in the 1970s.
Mark Felt told Vanity Fair that he was known as "Deep Throat" by two reporters who helped uncover the incident which led to the resignation of President Richard Nixon.
The Washington Post reporters, Bob Woodward and Carl Bernstein, have refused to identify the source until that person's death.
The journalists often quoted "Deep Throat" in news reports which showed Nixon administration officials had paid burglars caught breaking into a Democratic Party office at the Watergate hotel.
President Nixon, a Republican, later resigned during his impeachment trial, following reports that he tried to delay an FBI investigation into the break-in.
Mr. Felt is now 91 years old and living in California. The identity of the source for the Watergate reporting has been a much debated mystery.
Some information for this report provided by AP and AFP.