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Colombia has doubled to nearly one million dollars of reward for information leading to the capture of a criminal gang leader. President Juan Manuel Santos says security forces were hunting for Dario Antonio Usuga. He says the Usugaclan has ties with Mexico Sinaloa Cartel and it was responsible for smuggling hundreds of millions of dollars of cocaine to Colombia each year. Experts predict that gang crime is likely to become Colombia's biggest security challenge as the country's long-standing conflict with leftwing rebels winds down.