Mexican authorities want to speak with U.S. actor Sean Penn and Latin television star Kate del Castillo, a Mexican law enforcement official told NBC News Sunday. The revelation came a day after Rolling Stone published a secret interview that Joaquin "El Chapo" Guzman apparently gave to Penn while on the run. The official also said that investigators were able to learn details about Guzman's whereabouts by intercepting phone conversations between Penn, Del Castillo and the drug lord.