ATF (Buerau of Alcohol, Tobacco, Firearms and Explosives) Senior Agent in Charge William Newell demonstrates how some weapons can be concealed while standing in one of the bureau's "vaults", where guns confiscated in crimes, some that have been smuggled into Mexico, are stored as evidence for trial or waiting to be melted down in Phoenix, Arizona, July 6, 2007. A war without quarter for control of cocaine, marijuana, methamphetamine and heroin trafficking routes has killed 1,300 people this year in Mexico, and has created a huge demand among rival drug gangs for weapons of all kinds, authorities say. To match feature USA-MEXICO/GUNS REUTERS/Jeff Topping (USA)