Mexico says U.S. has not responded to request to return accused drug lord

MEXICO CITY (Reuters) -Mexican Attorney General Alejandro Gertz said Tuesday that the U.S. government has not yet responded to Mexico's request to extradite accused senior drug lord Ismael "El Mayo" Zambada back to Mexico, after he was flown to the U.S. and arrested there last year. Gertz noted that late last year the U.S. government confirmed it had received the Mexican government's extradition request for Zambada, the co-founder of the powerful Sinaloa Cartel along with jailed kingpin Joaquin "El Chapo" Guzman.