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The scene was straight out of a B movie: Run-down mansion. Tony neighborhood. Anonymous tip. The whiff of celebrity. And a jaw-droppingly large cache of weapons, some of questionable legality.

Investigators with the federal Bureau of Alcohol, Tobacco, Firearms and Explosives descended on the tatty Bel-Air mansion along with members of the Los Angeles Police Department in the early morning darkness.

What they found there Wednesday was both lethal and perplexing. The sprawling white clapboard house — two stories, five bedrooms hidden behind a discolored gate and a tall hedge — was in complete disarray. Guns were everywhere in what authorities described as a hoarder’s paradise in the 100 block of North Beverly Glen.

There were AR-15 military-style automatic rifles, what appeared to be a World War II-era Thompson submachine gun, .44-caliber handguns, .357 magnum revolvers, long guns with intricately carved stocks, an Uzi 9-millimeter submachine gun — complete with silencer — and a 9-millimeter Luger pistol.

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