http://edition.cnn.com/2012/01/17/world/americas/mexico-city-security/index.html
LONG READ
Mexico City...aka the D.F./Distrito Federal...has escaped Mexico's widespread brutal and bloody narco violence...for the most part.
It has a strong police force.
And the military is based there.
But...some recent events...now have resident Chilangos...nervously looking over their shoulders.