The shooter is now known to be Antifa, so you can add them into the mix.
The shooter shares the same last name and an address not far from a crooked former leftist boss who fired me in September 2016 for a BS reason which can be traced back to a personal disagreement. I am guessing a nephew or possibly a grandson. I would call it into the FBI, but it might put me in the crosshairs of this corrupt agency instead.