Could be early Perseid meteors, Anon.
https://en.wikipedia.org/wiki/Perseids
Been watching local news since about an hour or two after it happened. Many early eyewitnesses, including some actually trapped in the store, reported as many as three shooters dressed in black. Reports are being sanitized and forced into a typical "lone wolf" story.
This sounds like that guy who shot up a Texas church. Didn't he get turned around by hundred of miles?
Local news KTSM is reporting that a "manifesto" is being inspected by police as possible evidence for a hate crime. Was also said at the press conference. Unclear if it's the same manifesto being reproduced here. If the DS puts it forward seriously, then we have to treat it seriously enough to analyze.