NEW : The Tamaulipas state governor appoints a new head of public security . MEXICO CITY -- He is a presumed leader of the Zetas drug cartel in northeastern Mexico . Tamaulipas is one of Mexico 's most active states when it comes to drug trafficking .
NEW : The Tamaulipas state governor appoints a new head of public security . Martin Omar Estrada Luna has been captured , Mexico 's government says . He is a presumed leader of the Zetas drug cartel in northeastern Mexico . Tamaulipas is one of Mexico 's most active states when it comes to drug trafficking .