Hey there... they weren't at any risk. Dad and D are home now. D's daughter in law was the other one that was there. They'd just gotten there and were about to go in when people came streaming out and somebody told them about it. They just got stuck in the traffic mess that resulted for blocks around.
I'm so glad they didn't get there earlier. Better to be stuck in that awful traffic, than to be stuck in the mall with the looney.