According to preliminary information, Jabber, a U.S. citizen born in Texas, had a black flag affixed to the hitch of the pickup truck he allegedly drove into the crowd. Officials are investigating whether that flag is related to the terrorist group ISIS, two senior law enforcement officials said.
I’m going to make a prediction and say it’s self-radicalization. As for which group he self-radicalized to, I’ll wait until more information comes out. I have an obvious suspicion, but I’d rather wait.
It doesn’t matter because it’s not his problem anymore.