British and American intelligence suspect that ISIS or some other terrorist body had an inside person at the Cairo airport. They feel sure a bomb was planted in luggage aboard the doomed Russian Airbus that fell to the earth in the desert last week. British passengers preparing to return home have been told they cannot put any luggage in the hold of their aircraft, which is being treated as the weak link in the airport’s security. Instead their luggage will be sent on in a separate cargo plane. US officials have said intelligence suggests the Islamic State of Iraq and the Levant or another terrorist group may have had “an assist from someone at the airport” and the British security services have discovered evidence of a plot to carry out a major atrocity.