ISTANBUL   The US Drug Enforcement Administration (DEA) said that its agents arrested hundreds of Sinaloa Cartel members and seized large caches of guns and drugs during a weeklong operation against a powerful Mexican cartel. The federal officials arrested 617 individuals linked to the Sinaloa Cartel and also seized 480 kilograms of fentanyl powder and 420 firearms, among other things, in a nationwide crackdown carried out on Aug. 25-29, a DEA statement said on Monday. “These results