Take a look at the numbers behind drones -- America's mysterious instruments in the war on terror.
On the eve of a speech by President Barack Obama about his administration's counterterrorism policy, Attorney General Eric Holder acknowledged for the first time Wednesday that U.S. drone strikes have killed four Americans overseas since 2009. Here's a look at drones by the numbers:
On the morning of April 19, 1995 Timothy McVeigh killed 168 people during…
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