I've heard that the concern is that these things have been brought across the Mexican border and are in the hands of Mexican and South American gangs. The Islamo-Nazis don't need anything but money to hire the gangsters.
Very scary.
Yup. And there's basically nothing that anyone can do about it other than the impossible of excluding everyone from a 40 mile radius around an airport.
Oh, except go over and kill all the people who order the shooting. And all their devotees in the area. That usually tends to stop such plots.