American agents in Ankara investigated Cicero's identity based upon Dulles' intelligence. British intelligence, which was asked by Dulles to interrogate Cicero, gave the impression that it believed Bazna could not speak English and, furthermore, was "too stupid" to be a spy. British Foreign Office workers, though, were concerned about Operation Overlord leaks and thought that Bazna might be Cicero. They implemented a sting in January 1944 using a false Cabinet Office document that was drafted by the chair of the Joint Intelligence Committee, Victor Cavendish-Bentinck, and given the forged signature of Foreign Secretary Anthony Eden. The document was planted in the embassy, but the sting was unsuccessful in trapping Bazna.