The lockdown for Dover Air Force Base in Delaware was lifted Thursday afternoon after no suspicious person could be located.
The base went into lockdown for nearly four hours after reports came in of a suspicious person on the base near Building 706, with some worrying it could be an active shooter situation, reports the Wilmington News Journal.
But Base spokesperson Airman First Class William R. Johnson downplayed that possibility earlier saying, "At this time we have no information that would leave us to believe that there is an active shooter on the base."
Air Mobility Command Museum director Mike Leister noted that he also heard about the possibility of a shooter on base, but wasn't sure where how he came across that report.
According to Philly.com, in a statement Col. Randy Huiss, 436th Airlift Wing vice wing commander apologized for the lockdown "and confusion this response may have caused."
Students from the Positive Outcomes Charter School from Camden were visiting the museum and were safely secured until the lockdown was lifted. They were then sent back to their school.
The Maj. George S. Welch Elementary School on the Dover base continued classes during the lockdown, but students were kept from leaving classrooms.