....Tepito marketplace and barrio, in the Cuauhtémoc district of Mexico City.
Tepito, Mexico City's largest market where just about anything and everything can be found, has long been known for its illegal goods and criminal activities, and today it is said to be the base of operations for a number of gangs. ...
"'Every 15 days or every month I get strong requests: from 20 to 60 weapons,' a person affirmed who says he has eight years in this business.
"A percentage of the weapons, the seller said, come from Mexico via Ministry of Defense personnel who provide [them] in part from weapons seized in raids, or stolen from the ministry's own arsenal. ... "