At least 44 people are killed in a prison brawl in Apodaca, Nuevo León. The brawl is believed to have been started after the Gulf Cartel and Los Zetas, two rival Mexican drug cartels, clashed inside the prison.
Mexican Drug War: Alleged members of Los Zetas, a drug cartel originally set up by former soldiers of the Mexican Army, attack several media outlets in Monterrey for publishing on a rumored split between the two principal Zetas bosses.
Mexican Drug War: The dismembered remains of 7 bodies are found in the Mexican state of Sinaloa. The bodies are discovered along with a written message accusing the authorities of cooperating with the Sinaloa Cartel, suggesting that the message may have been written by Los Zetas.
Mexican Drug War: 49 dismembered bodies are discovered by Mexican authorities on Mexican Federal Highway 40. The decapitated and mutilated bodies were dumped on a roadside near the northern city of Monterrey, presumably by members of the powerful Los Zetas drug cartel.
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.
Three journalists are killed and their bodies dumped in plastic bags in a canal in Boca del Río in the Mexican state of Veracruz, where the rival criminal groups of Los Zetas and the Gulf Cartel are fighting for territorial control.
23 bodies—14 of them decapitated and 9 of them hanged from a bridge—are found in the Mexican city of Nuevo Laredo; those killed were reportedly members of the Gulf Cartel who were killed by Los Zetas, a rival cartel.