NEW : An Air Force official says no gunman was found and the site is ` ` secure '' The lock down was initiated days earlier after ` ` unconfirmed shooting '' of an armed man . FBI agents , along with local police , were dispatched to the Arizona air ##base to help . No shots were fired and no one was hurt , a local military official said .
NEW : An Air Force official says no gunman was found and the site is `` secure '' The lock down was initiated hours earlier after `` unconfirmed sightings '' of an armed man . FBI agents , along with Tucson police , were dispatched to the Arizona air base to help . No shots were fired and no one was hurt , a U.S. military official says .