That is just so terrible sad. It just goes to show that absolutely anything can happen. My hearts go out to these people, and I pray for the families of the victims.

Edit: I just watched a bunch of videos about this.
There's videos of people coming out of the theater covered in blood and there are witnesses talking about it. I really shouldn't have watched it tbh. So if that kind of thing bothers anyone don't watch any videos of witnesses or anything like that. It's very disturbing, to say the least.