VATICAN CITY (AP) — Pope Leo XIV surprised tens of thousands of young Catholics on Tuesday and showed up unexpectedly at a Holy Year welcome ceremony, thrilling the kids and receiving a rock star’s welcome in the first big youth event of his pontificate.

Leo emerged in St. Peter’s Square in his popemobile at the end of an evening Mass that kicked off the Jubilee of Youth, a weeklong celebration for young Catholics. The estimated 120,000 young pilgrims who had packed the square erupted in shocked cheers and chants, as Leo looped around the square and up and down the boulevard leading to it.

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