Ismael “El Mayo” Zambada, a key figure in the Sinaloa cartel and one of Mexico’s most influential drug lords, has been arrested in El Paso, a US border city. US Attorney General Merrick Garland announced the arrest on Thursday, which also involved Joaquín Guzmán López, the son of Zambada’s former partner and infamous cartel leader Joaquín “El Chapo” Guzmán Loera. According to Mexican media reports, both Zambada and Guzmán López surrendered to authorities voluntarily. The US Drug Enforcement Administration had offered a reward of up to $15 million for information that could lead to the arrest o…