The Foreign Ministry has decided to admit the existence of a secret Japan-U.S. pact under which Tokyo allows stopovers of U.S. military vessels or aircraft carrying nuclear weapons, ministry sources said Saturday.

During its in-house probe, the ministry found documents suggesting the existence of the secret nuclear agreement, according to the sources.

Previous governments led by the Liberal Democratic Party consistently denied the existence of the secret nuclear pact, but the new Democratic Party of Japan-led administration is to officially change that stance.