But the mood inside the cordon remained mostly good-humored with a jazz band, drummers and street theatre groups keeping the crowds entertained throughout the afternoon.
Groups of masqueraded dancers, actors, singers and instrumentalists delight crowds with theatrical and musical performances based on historical as well as current events.
Among the crowds are groups of pilgrims, who've traveled to Rome for the special and emotional occasion, as well as local residents and curious visitors keen to share in the moment.