First, this bomber is attackng by placing bombs in pkgs on door steps. Media tells everyone this guys M.O. so they get wise and are weary of any pkg's at their doors.

Next, the bomber adjusts his technique to account for the now educated and weary public by hiding the bombs and using a difficult to see (if you're looking for it; likely impossible otherwise) trip wire. This guy is at least semi-intelligent and motivated to cause harm. He's not finished yet and unless he's sloppy I suspect plenty more folks will be hurt or killed. Austin,TX is not someplace I'd want to be right now.