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FILE - This undated and unlocated frame grab provided Wednesday, March 21, 2012, by French TV station France 2 shows the suspect in the killing of 3 paratroopers, 3 children and a rabbi in March 2012.  Britain has planned for a dizzying array of security nightmares surrounding the Olympics, including a coordinated attack like the London transit bombings, a dirty bomb or a cyberattack.   In the wake of France's deadly shootings, one scenario weighing heavily on the minds of security officials is the self-starter operating with little or no help from others. (AP Photo/France 2, File) France 2 / AP Photo