CNN  —  The discovery of a severed horse head, and a cow quartered with its bloodied dead calf on top, have rattled a Sicilian town, with authorities treating the incident as a mafia threat. The dead animals were discovered on the property of a building contractor in the town of Altofonte, near Palermo, police told CNN. The gruesome scene was reminiscent of the 1972 film “The Godfather” where a character wakes up to find a decapitated head of a horse in his bed. The contractor, who is not being