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A policewoman stands inside the police c
  Attacked again
View images from London after four small explosions hit the city's transportation network on July 21.
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  July 7 attacks
Near simultaneous explosions rock the London subway and tear open a double-decker bus during the morning rush hour.
INTERACTIVE
July 7 snapshot
A timeline of the unfolding story from central London.
Free video: London blasts  
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Nightly News
Shoot to kill
Aug. 7: It's a controversial policy, but "shoot to kill" is gaining support among police looking for a way to stop suicide bombers. NBC's Ron Allen reports.

  NBC News special series

Is airport security better now since Sept. 11? How can you avoid airport aggravation during your travels? An NBC News special series looks at what you need to know.

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