from /pol/
Doesn't appear to be a false flag.
https://boards.4chan.org/pol/thread/320961028
Still worth investigating but if you read the 4chan thread I linked there are a few theories that he is connecting to that Navalny guy. Usually in false flags the shooter suicides. Even if it is real the media can twist the story; saves a lot of time setting up a false flag. Have to see what the narrative will be. The shooter looks Muslim or Asian, they can juice some racial or religious tension out of this.