Bulgarian police arrested a passenger for carrying ammunition on a plane after a tip-off from a foreign intelligence service.
Interior Minister Rumen Petkov told the daily Trudnewspaper that the National Security Service received "information that a terrorist attack was being prepared on a plane supposed to take off from a Bulgarian airport".
He added: "We found ammunition cartridges in a passenger's luggage. The passenger was supposed to fly on the plane but was detained."
Media reports said the flight involved was an August 30th one from Bulgaria's Black Sea port of Varna to Moscow and the passenger arrested was a 55-year-old Russian woman.
Bulgarian National Radio said rifle cartridges were found in the woman's checked luggage and no gun was found on the plane.