In this photo taken Friday Jan. 18, 2013, masked and armed men sit in the back of a pick-up truck at the entrance to the town of Ayutla, Mexico.  Hundreds of  men in the southern Mexico state of Guerrero have taken up arms to defend their villages against drug gangs, a vigilante movement born of frustration at extortion, killings and kidnappings in a region wracked by violence. (AP Photo/Dario Lopez-Mills)
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