13 bodies found in mass grave near Mexico City this week . Of those 12 , Four have been identified as youths kidnapped from Mexico City bar . 12 youths were kidnapped from after-hours club in this week , authorities say . 12 people have been arrested in the case .
13 bodies found in mass grave near Mexico City this week . Of those 13 , five have been identified as youths kidnapped from Mexico City bar . 12 youths were kidnapped from after-hours club in May , authorities say . Four people have been arrested in the case .