On 17 June 2011 , federal police captured Édgar Huerta Montiel , a high-ranking boss in Los Zetas and the man responsible for the killing of 72 migrants in 2010 . He confessed during interrogation that " more than 600 bodies " were buried in clandestine mass graves near San Fernando , unconfirmed by Mexican authorities . Isabel Miranda de Wallace of " Stop the Kidnappings " suspects that the mass graves in San Fernando contain more than 500 dead , but that the government of Tamaulipas has not released such information because of the political troubles it may instigate
killing of 72 migrants
2010 San Fernando massacre
2011 San Fernando massacre