The FBI released a report today suggesting that "active shooter incidents" grew more common from 2000 to 2013. Reason readers may wonder how to square that conclusion with the statistics we've published suggesting that mass shootings are not on the rise. There are two answers to that. One involves some potential problems with the FBI's numbers; we'll get to those issues in a moment. The other answer is simpler: "Active shooter" and "mass shooting" do not mean the same thing. [read the full story here]