There’s Still No Answer As To What Caused An Explosion And Fire Six Months Ago That Destroyed A Building At Holston Army Ammunition Plant In Kingsport. BAE Systems Spokesman Chris Finley Says Evidence Has Been Collected And An Internal Investigation Is Underway. Operations At The Plant Aren’t Fully Back To Normal. Finley Said The Army And His Company Are Continuing To Find The Cause Of The Blaze That Caused Explosives To Catch Fire.