You would think that there would have been cameras to catch the action.  Also, I'm not sure that the General should assume that someone else did the deed.  In March 2017, a Jewish man was arrested for making bomb threats against "Jewish schools and facilities."
https://www.google.com/amp/s/www.washingtonpost.com/amphtml/news/post-nation/wp/2017/03/23/jewish-groups-say-they-are-relieved-and-heartbroken-after-arrest-in-jcc-threats/