Carabinieri officers salute with the sirens of their cars in front of the church where Carabinieri officer Mario Cerciello Rega was laid in state, in Rome, Sunday, July 28, 2019. In a statement Saturday, Carabinieri officers investigating the death of Cerciello Rega, 35, said two young American tourists have been detained for alleged murder and attempted extortion. (AP Photo/Andrew Medichini)