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Mexico's government allowed a group of undercover U.S. anti-drug agents and their Colombian informant to launder millions in cash for a powerful Mexican drug trafficker and his Colombian cocaine supplier, according to documents made public Monday.

The Mexican magazine Emeequis published portions of documents that describe how Drug Enforcement Administration agents, a Colombian trafficker-turned-informant and Mexican federal police officers in 2007 infiltrated the Beltran Leyva drug cartel and a cell of money launderers for Colombia's Valle del Norte cartel in Mexico.