The shooter, a Mr. Yung, was arrested last night. He is a former corrections officer who is now likely insane, although his recent divorce might have broken him.
http://www.nbcwashington.com/news/local/Shots-Fired-Near-NSA-Headquarters-294909111.html
yep it appears they got their man.
I trust he wasn’t somebody who “somebody else” got to before this spree he went on..