UPDATE: Florida's MacDill Air Force Base was briefly locked down Friday morning, officials said, after what initially was described as a report of a shooter.

The base had been under lockdown around 7:30 a.m. ET, but an all-clear has been given, MacDill spokesman Staff Sgt. Rito Smith said around 8 a.m.

Smith did not provide further details about what led to the lockdown.

The lockdown was issued after reports of an active shooter, and commands on base were told it wasn't a drill, US Special Operations Command spokesman Phillip Chitty said.

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