Two U.S. students have been arrested for the stabbing of the Carabinieri officer Mario Cerciello Rega early on Friday. The two men had stolen a bag from a man, and when the officer tried to arrest the thieves, he was stebbed. Police murders are rare in Italy. One of the arrested students, a 19-year-old, have confessed to the killing. US student reportedly confesses to killing police officer in central Rome