Municipal police guard the entrance to Rancho La Mesa where a mass grave was found in the municipality of Tlalmanalco, Mexico, Thursday, Aug. 22, 2013. Mexican authorities said they found the mass grave east of Mexico City and are testing to determine if it holds some of the 12 people who vanished from a bar in an upscale area of the capital nearly three months ago. (AP Photo/Ivan Pierre Aguirre)
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