A prisoner in Italy is thought to have used a drone to smuggle a gun into his jail before shooting fellow inmates, authorities said. The 28-year-old man--who has links to the Camorra mafia in Naples--fired three shots at other prisoners through cell bars, a prison union has said. There were no reports of any injuries, the union added. The incident took place at the high-security Frosinone prison, around 100 kilometres southeast of the capital, Rome.It is believed the prisoner had fired the handg