Whack-a-mole Drug War: Monterrey Massacre Comes Amid Gulf-Zetas Battles

From 'InSight Crime'

Monterrey Massacre Comes Amid Gulf-Zetas Battles: "The slaughter of at least 20 people in a Monterrey bar is another violent manifestation of the ongoing battle for control of this north Mexico city, a vital link in the drug trade. ...

Because of the location of the attack, speculation about who was responsible centered on the Gulf Cartel and the Zetas, both of whom have a strong presence in Monterrey, the nation’s third-largest city.

However, in a series of public banners, or "narcomantas," left around the country over the weekend, the Zetas denied responsibility for the crime, attributing it to the Gulf Cartel. Sources inside the Mexico’s federal government told InSight Crime that they suspect agents of the Gulf Cartel fired on the bar because they thought Zetas congregated there."