Three elderly Italian nuns were sexually assaulted and murdered in twin attacks in their convent in the capital of Burundi, police said today as a hunt was launched for their killers. Police initially reported that two nuns were stabbed to death yesterday afternoon. The killer then battered one of the two with a rock, before fleeing the convent. Italian authorities named the first two killed as Olga Raschietti, 83, and Lucia Pulici, 75, both Roman Catholic nuns. But in the early hours of today morning, another nun in the same convent was killed, her body beaten and head hacked off....