Update: Gunshots fired involving a TVA nuclear security officer outside the Watts Bar nuclear plant

photo Watts Bar

Arkansas-St. John's Live Blog

A TVA security officer patrolling on utility property near the Tennessee River at Watts Bar Nuclear plant exchanged gunfire with an unknown person early Sunday morning, according to regulators with the U.S. Nuclear Regulatory Commission.

TVA said there was no threat to public safety, but the agency declared an "unusual event" to the NRC, spokesman Roger Hannah said. An unusual event is the lowest of the NRC's four emergency classifications.

Hannah said NRC staffed its incident response center in the commission's Atlanta office and monitored the events along with the NRC resident inspector who responded to the site at about 2 a.m.