The governor of Nuevo León, where the prison is located, said the violence began as a fight between two groups of inmates, one of which was headed by a leader of the Zetas drug cartel.
Jorge Parral Rabadan beat out 1,000 applicants for a job running a Mexican border bridge with Texas. He denounced rising insecurity at his post until he was kidnapped, taken to a ranch, and killed by point-blank gunfire from the Mexican military.
El Bronco, the country's first independent governor, takes office in Nuevo Leon and amid barbs with Andres Manuel Lopez Obrador — a hint of both men's anti-system presidential aspirations ahead of 2018 election.
Since Friday, violent attacks or gruesome discoveries of corpses have rocked wealthy Nuevo Leon and poverty-stricken Guerrero, where most of the violence was centered in the resort of Acapulco.
Turns out "El Bronco" spent thirty years in Mexico's ruling party. But even so, his landslide victory in Nuevo Leon marks a turning point — away from Mexico's political status quo.
Indie candidates also stormed to victory in key races in Jalisco, while the upstart leftist Morena movement made gains in Mexico City and in Congress. One man is killed in Guerrero.
Protesters burned ballots and attacked polling places in Guerrero, Oaxaca, and Chiapas. Exit polls were suggesting tight races in key state governor races, including Nuevo Leon, where indie candidate "El Bronco" was pulling ahead.
This catastrophe comes in the wake of several other environmental disasters in the northern part of Mexico.