April 14 (Reuters) - The United States has charged leaders of the Mexico-based Sinaloa Cartel with running a fentanyl trafficking operation fueled by Chinese chemical and pharmaceutical companies, U.S. Attorney General Merrick Garland said on Friday. Federal prosecutors unsealed three separate indictments charging more than two dozen defendants based in Mexico, China and Guatemala, eight of whom are in custody. Among those awaiting extradition is Ovidio Guzman Lopez, one of El Chapo's sons, who was arrested in Mexico earlier this year. Prosecutors also charged four owners of Chinese companies that allegedly provided precursor chemicals to the cartel. "The PRC government must stop the unchecked flow of fentanyl precursor chemicals that are coming out of China," he said, referring to the People's Republic of China.

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