I think this story has already been surpassed by even more violent
incidents in Monterrey and Nuevo Leon.  Below is the story of the police
chief killed this weekend in San Pedro. If the number of 324 for this year
so far in Nuevo Leon is true, then the killing there might actually surpass
Chihuahua.

CBC World News

Mexicans fear losing country to Zetas drug cartel

Latin American Herald Tribune

Police Commander Murdered in Northern Mexico