In mid-2011 , Mexican authorities reported several bus hijackings and mass abductions in San Fernando . According to the reports , members of Los Zetas had been hijacking buses near San Fernando and taking people by force , often in large numbers . Mexican authorities then discovered that the victims were buried in mass graves ; after several excavations , 193 bodies were exhumed
193 bodies were exhumed
2011 San Fernando massacre
Infighting in Los Zetas