The scare at the National Guard Armory in Florida was sparked by a phone call to police. The caller told police that a man approached him and told him to call authorities because he had placed a bomb at the armory.
Authorities inspected the facility in the state capital of Tallahassee, but saw nothing suspicious, police said.
The incident comes five days after 24-year-old Muhammad Youssef Abdulazeez fatally shot four Marines and a sailor at two military sites in the state of Tennessee.