Law enforcement in Milan is investigating the source of an envelope containing three bullets addressed to the pope, Italian paramilitary police said Monday.

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The suspicious envelope was intercepted by postal employees overnight at a mail sorting facility in a Milan suburb, according to the carabinieri provincial command in Milan. It had been sent from France.

The envelope was addressed by hand in pen to: "The Pope, Vatican City, St. Peter’s Square, Rome," and contained three bullets presumed to be for a pistol and a message referring to financial operations at the Vatican.

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An investigation is ongoing. There is no immediate comment from the Vatican.