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This handout picture released by the Vatican press office shows Pope Francis and Pope Tawadros II, spiritual leader of Egypt's Orthodox Christians, signing a joint declaration pledging to "strive for serenity and concord through a peaceful co-existence of Christians and Muslims" on April 28, 2017 at St. Mark's Cathedral in Cairo during a two-day visit in Egypt. / AFP PHOTO / OSSERVATORE ROMANO AND AFP PHOTO / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / OSSERVATORE ROMANO" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS