Tijuana is among the cities hardest hit by violence as Mexico's drug cartels battle for lucrative smuggling routes past the border to supply illegal drug users in the United States.<ref>[http://www.boston.com/bostonglobe/photos/photos_galleries/mexicodrugviolence/ Mexico's violent year of drugs.]</ref> | Tijuana is among the cities hardest hit by violence as Mexico's drug cartels battle for lucrative smuggling routes past the border to supply illegal drug users in the United States.<ref>[http://www.boston.com/bostonglobe/photos/photos_galleries/mexicodrugviolence/ Mexico's violent year of drugs.]</ref> |