FILE - In this May 9, 2012 file photo, people hold photographs 

FILE - In this May 9, 2012 file photo, people hold photographs of their relatives who went missing during a protest that is part of the campaign "March of National Dignity. Mothers searching their sons and justice" held at the Revolution Monument in Mexico City.  A new report by a civic participation group has put a number for the first time on the human toll of all the violence: 20,851 people disappeared over the past six years, although not every case on the list may be related to the drug war. With at least another 70,000 people having died in drug violence, the numbers point to a brutal episode in Mexico that ranks among Latin America's deadliest in decades.  (AP Photo/Alexandre Meneghini, File)
Associated Press
FILE - In this May 9, 2012 file photo, people hold photographs of their relatives who went missing during a protest that is part of the campaign "March of National Dignity. Mothers searching their sons and justice" held at the Revolution Monument in Mexico City. A new report by a civic participation group has put a number for the first time on the human toll of all the violence: 20,851 people disappeared over the past six years, although not every case on the list may be related to the drug war. With at least another 70,000 people having died in drug violence, the numbers point to a brutal episode in Mexico that ranks among Latin America's deadliest in decades. (AP Photo/Alexandre Meneghini, File)
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