(WHAS11) -- The search is on for the person who exchanged fire with a security guard at an east Tennessee nuclear plant.
Officials at the Watts Bar Nuclear Plant say early Sunday morning the guard noticed a boat near the plant, when the guard approached the boat the person inside started shooting. The guard called for back up but the boater took off .
The plant was then put on lockdown. The shooting happened about a quarter mile from the plant's protected area so the FBI is getting involved with the search.
The security guard was not hurt and after a thorough search government officials say there are no further security threats at the plant.