Mexico violence: Alarming parallels to previous brutalities

The large-scale offensive against drug cartels that began in 2006 touched off a wave of violence unprecedented since the Mexican Revolution, marked by homicides of immense brutality as gangs seemingly sought to one-up each other.August 2011: Armed attackers carrying fuel canisters enter the Casino Royale in the northern industrial city of Monterrey, shoot some patrons, douse the place and set it alight before fleeing.Authorities attribute the attack to the Zetas cartel enforcing demands for exto