War Between Zetas and Sinaloa Drug Cartels Heating Up

June 2, 2007, 3:08AMPolice find 3 unexploded grenades in Mexico City subway

MEXICO CITY — Police found unexploded grenades in two Mexico City subway stations Friday, and said the explosives were accompanied by messages against the "Zetas," a gang of hit men tied to the Gulf drug cartel....

....The Zetas are engaged in a bloody turf battle with the rival Sinaloa cartel that has left hundreds dead. But most of those deaths have occurred in a few provincial states, while Mexico City has largely been spared the kind of drug-gang battles that have terrorized other cities.
The grenades appeared to be part of a wave of threats against the Zetas that appeared across the Mexican capital. Hours earlier Friday, at least two banners were found strung across busy thoroughfares in the capital with threatening messages.

The Rest @ The Houston Chronicle