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Map: Where Predator aircraft patrol the U.S.-Canada border Add to ...

The unmanned planes look north toward the long, lightly defended and admittedly porous Canada-U.S. border - the best route many Americans believe for jihadists seeking to attack the United States to sneak across.Like their missile-carrying military cousins prowling Pakistan's skies targeting al-Qaeda suspects, the unarmed Predator aircraft that have patrolled the 49th parallel since 2009 are high-tech, sophisticated and little understood. And they are part of the same diffuse and determined effort the Unites States is making to secure its borders and defend itself.

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