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By BOB CHRISTIE and FELICIA FONSECA / Associated Press

PHOENIX (AP) -- Arizona authorities say a package addressed to Sheriff Joe Arpaio would have exploded if opened, leading to serious injuries or death.

Maricopa County Chief Deputy Jerry Sheridan made the comment Friday at a news conference in Phoenix.

The package intercepted in Flagstaff late Thursday was addressed to Arpaio at his downtown Phoenix office. It had been left in a parcel locker in a rural part of Coconino County.

U.S. Postal Inspection Service spokesman Keith Moore says a courier brought it into the main Post Office in Flagstaff, and authorities used a water cannon to neutralize the package.

Arpaio, the self-proclaimed "toughest sheriff in America," says this isn't the first time he's been threatened.

Authorities in Flagstaff are pursuing leads in the case.

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