A new plague
UK developments produce more questions than answers
By Henry Schuster
Editor's Note: Henry Schuster, a senior producer in CNN's Investigative Unit and author of "Hunting Eric Rudolph," has been covering terrorism for more than a decade. Each week in "Tracking Terror," he reports on people and organizations driving international and domestic terrorism and efforts to combat those.
Scenes like this, with barricades and swarms of police, have become commonplace in England.