Catholics attend mass at the Basilica of Our Lady of Guadalupe in Mexico City after the death of Pope Francis. "It obviously fills us with a sense of deep sadness and at the same time also of profound gratitude and deep reflection for all that he gave us," says one Catholic devotee outside the basilica, one of the most visited religious sites in the world. "I believe he gave everything for us," adds Catholic devotee Concepcion Talavera. IMAGES AND SOUNDBITES