Ismael ‘El Mayo’ Zambada: How US caught drug kingpin after 35 years BBC.comUS operation to capture Sinaloa cartel leaders had the help of one of the captured men: a son of ‘El Chapo,’ official says CNNHow the U.S. Captured One of Mexico’s Biggest Drug Lords The New York TimesMexico wasn’t told of cartel arrests until kingpins were in U.S. custody The Washington Post