A look at the troubled history of Chechnya, where the Boston Marathon bombings suspects are said to have come from.
Chechen militants have, however, been involved in a series of terror attacks in Russia and the surrounding North Caucasus region in recent years. In 2010, two female suicide bombers hit the Moscow Metro system at the height of rush hour, killing 40 and injuring more than 100.
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Washington State National Guard
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