Officials say a person who was acting erratically and approached security personnel at the Ellsworth Air Force Base was detained and turned over to police.
The main gate at the base was closed for about four hours Sunday after the individual showed up.
Authorities were not specific about what the person was saying or doing.
He was detained and turned over to Box Elder police.
Members of the 28th Civil Engineer Squadron Explosive Ordnance Disposal team were called to inspect the suspect’s vehicle.
Nothing suspicious was found.
Traffic was redirected to the base’s commercial gate while the scene was investigated.
The main gate reopened about 8 p.m.