Scheduled tour reservations will be honored through early April. No specific threat prompted the change in security at the center beneath Cheyenne Mountain, but terrorist bombings like the attacks on embassies in Africa last year raised new fears, said Navy Cmdr.
People are able to bring smaller and smaller objects in that can do a lot of damage.
That is a concern,'' Knox said. Most future tours will be confined to a building outside the mountain, where visitors will be able to view a video presentation of the base's elaborate interior.