Forensic physicians carry out an autopsy on a unknown person at the morgue of Rosario, north of Buenos Aires, September 10, 2015. International drug-enforcement officials have taken to calling Rosario "The Tijuana of Argentina" for what it has in common with the Mexican border city used to move cocaine into the United States. Experts say the drug enters Argentina by truck or plane from Andean cocaine-producing countries to the north. The smuggling routes narrow the closer shipments get to Rosario, increasing violent competition among gangs to control the final steps toward the Parana River, which leads south to Buenos Aires and the shipping lanes of the Atlantic. Drug-related killings spiked so high in Rosario last year that federal forces were called in to provide security. To match story ARGENTINA-DRUGS/ Picture taken September 10, 2015. REUTERS/Enrique Marcarian