VATICAN CITY (AP) — Pope Leo XIV took his first popemobile ride through St. Peter’s Square ahead of his installation on Sunday, waving from the back of the open-back truck to the crowd waving flags and cheering “Viva il Papa!”

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The service marks the official start of Leo's papacy just under a month after the death of his predecessor, Pope Francis. The ceremony began with a procession from St. Peter's Basilica — where Leo and other church leaders visited St. Peter's tomb to pray — to St. Peter's Square, where the Inauguration Mass was held.