Sinaloa has controlled Guadalajara, which is the capital of the western state of Jalisco, for decades.

NEWYORKER: The Kingpins

But the Zetas have been pushing westward from their strongholds on the Gulf Coast, and they had already taken the neighboring state of Zacatecas, so there was no reason to doubt that they coveted Jalisco, a rich prize, or that this was indeed their atrocity and their message to Guadalajara.

NEWYORKER: The Kingpins

Guadalajara is fast-becoming Mexico's Silicon Valley with tech entrepreneurs from across Mexico flocking to the capital of Jalisco state.

CNN: Immigration reform gets U.S. in on Mexico's boom