The weapons from a botched U.S. firearms investigation are cropping up in anti-cartel operations in Mexico, a Justice Department summary issued Tuesday confirmed.

According to a report compiled for two Republican congressional committee chairmen, a WASR-10 rifle purchased six years before in the U.S. as part of the Bureau of Alcohol, Tobacco, Firearms and Explosives’ (ATF) Operation Fast and Furious was one of three rifles used in a July 27 attack in the town of Valle de Zaragoza that left three Mexican police officers dead.

Another weapon tied to the operation was uncovered in the hideout where Sinaloa Cartel drug leader, Joaquín “El Chapo” Guzmán Loera, was arrested in January.

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