Large crowds filled streets and a main boulevard in Buenos Aires on Monday as Pope Leo XIV was due to celebrate an outdoor Mass. Pilgrims had camped overnight in Palermo, singing, praying and waving Argentine and Vatican flags; city officials said the Mass could attract more than 1.5 million people.
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These publishers contributed reporting to the broader event history. Not every source addresses the specific development described above.
How this brief is built: The BriefBrief correlates multiple sources into one evolving event brief, updated as new facts emerge.
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