An 'all clear' signal was given at Patrick Air Force Base in Florida on Friday an hour after a bomb threat forced authorities to evacuate the area, the base said in a tweet. 'There is no credible threat to the area at this time,' the air force base said. The threat came hours after four people were killed and eight injured in a shooting at the Naval Air Station Pensacola. A member of the Saudi Air Force visiting the United States for military training was the suspected shooter.
