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A storm-water channel connecting the higher-elevation Nogales, Sonora, brings runoff into Nogales, Ariz., and can also deliver illegal immigrants willing to risk drowning when the waters rise.
A metal fence divides Nogales, USA from another Nogales: Nogales, Sonora, a much poorer Nogales where law enforcement is under attack from drug trafficking cartels and the cartels are under attack from many rivals.
This ABC News report examines threats against Nogales (Ariz.) police officers following off-duty drug busts. The department learned through its criminal informants that the threats are credible. Chief Jeffrey Kirkham is interviewed.