ROME—Italy paid tribute Thursday to its ambassador to Congo and his bodyguard who were killed in an attack on a U.N. convoy, honoring them with a state funeral and prayers for peace in Congo and all nations “torn by war and violence.” Cardinal Angelo De Donatis, the pope’s vicar for Rome, presided over the solemn funeral at the Santa Maria degli Angeli basilica that was attended by Premier Mario Draghi, top lawmakers, representatives of the armed forces, and relatives of the young men. Ambassador Luca Attanasio and Carabiniere paramilitary officer Vittorio Iacovacci were killed Monday north of Goma when an armed group stopped them as they traveled in a two-car convoy to a World Food Program school feeding project. WFP’s Congolese driver, Moustapha Milambo, was also killed in the attack. Italy has formally asked the U.N. for an inquiry into what happened amid questions about whether the U.N. security arrangements …