The army arrests Ovidio Guzmán López, the son of incarcerated drug lord Joaquín "El Chapo" Guzmán, in Culiacán, Sinaloa. The arrest is followed by state-wide unrest, with many schools and airports closed. Ten soldiers and 19 gang members are killed during the unrest.
The U.S. Customs and Border Protection reports that in August it discovered a 1,313 m smuggling tunnel running from Tijuana to San Diego, making it the longest tunnel of its type along the Mexico–United States border. It was possibly used by the Sinaloa Cartel.
A 5.8 magnitude earthquake strikes off the coast of the Mexican state of Jalisco, prompting evacuations in the tourist resort of Puerto Vallarta and is felt in the country's second-largest metropolitan area of Guadalajara. No casualties are reported.
15 mutilated bodies are found inside two abandoned SUVs in the state of Jalisco, a region that is under dispute between Los Zetas and the Sinaloa Cartel. The Mexican authorities believe the massacre is a response by Los Zetas for the 2012 Nuevo Laredo massacres reportedly carried out by Joaquín Guzmán Loera (a.k.a. "El Chapo"), Mexico's most-wanted drug lord.