UPDATE 1-"All clear" given at Patrick Air Force Base in Florida after bomb threat

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.