The Wright-Patterson Air Force Base in the US state of Ohio has been closed after reports of shooting on its territory, the command of the 88th wing of the air base said on Twitter.

The shooter was reportedly spotted in the recently completed National Air and Space Intelligence Center building. The 88th Air Base Wing confirmed that there was an ongoing incident in a post to its Twitter account.

“At approximately 9:25pm, emergency responders responded to a report of an active shooter in the National Air and Space Intelligence Center in Area A at WPAFB,” they wrote.

“Security Forces are currently sweeping the building. The base is on lockdown.”

In video clips on social media, announcements over the tannoy can be heard telling people that a lockdown was in force.

People living within a mile of the base heard the repeating alarm which says: “Lockdown, lockdown, lockdown for Wright-Patterson Air Force Base.”

US journalist Bryn Caswell said that no injuries had been as yet reported.

A second sweep of the NASIC building is now taking place.

The first search took two hours to complete. Lockdown remains in force.

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