The Sicilian mafia’s hitmen are skilled and practiced, their murders are rarely botched, even when carried out from the back of a motorcycle traveling at speed. But one of the many mysteries that surrounds the Cosa Nostra is where its killers acquire their lethal dexterity. It is known they have practiced in the Sicilian countryside. But the flat crack of a pistol, which sounds quite unlike the report of a shotgun, can swiftly attract unwelcome attention.Part of the answer to the puzzle has emerged in Palermo’s notorious Zona Espansione Nord (Zen) - a complex of housing estates on the edge of the city which was the fiefdom of the city’s top mobster, Salvatore Lo Piccolo, known as the Baron, until his arrest last year.There, 10 meters below ground in a warren of passages, police have found a firing range littered with 9 x 21 caliber ammunition - the Italian mobster’s favorite.Sara Fascina, the police commander whose officers discovered the complex, said it also seemed to have been used ...