MONTERREY. Mexico (AP) — Mexican authorities say they found 16 bodies in three clandestine graves on the outskirts of the northern industrial city of Monterrey, an industrial city that has seen an upsurge in drug cartel-related violence, officials said Wednesday.A spokesman for Nuevo Leon state's investigative agency says burial sites were on an abandoned ranch in the township of Juarez. That's the same area where 51 bodies were found in mass graves in 2010.There is no immediate information on the victims' identities or those of their killers, but authorities said previously the 2010 burials were probably carried out by a drug gang.