The pontiff, prelates, and other faithful also clutching candles appeared as slow-moving points of light in darkness, part of a procession symbolising Christians' belief that Jesus triumphed over death by resurrection following crucifixion.
The 82-year-old leader of the world's 1.3 billion Roman Catholics will lead an Easter vigil service on Saturday night and on Easter Sunday will read the traditional "Urbi et Orbi" (To The City and The World) message.
"Before the many sufferings of our time, may the Lord of life not find us cold and indifferent", he said, speaking in Italian after celebrating a Mass in the square.
Reports indicated that no fewer than 450 others were injured in bomb blasts that ripped through churches and luxury hotels in Sri Lanka on Easter Sunday, the first major attack on the Indian Ocean island since the end of a civil war 10 years ago.
"I want to express my closeness to the Christian community attacked while it was at prayer and to all the victims of this cruel violence", the Pope said.
US President Donald Trump in a twitter message expressed "Heartfelt condolences from the people of the United States to the people of Sri Lanka on the frightful terrorist attacks on churches and hotels, and he said We stand ready to help!"
In Cairo, the spiritual leader of Egypt's Al-Azhar Mosque, the Sunni Muslim world's foremost religious institution, condemned the "terrorist" attacks in Sri Lanka.
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"I entrust to the Lord those who have tragically been lost and I pray for the wounded and all those who suffer because of this dramatic event." moment of silence for prayer".
In his roundup of global conflicts, Francis warned that the world was increasingly becoming resigned to the ongoing conflict in Syria.
He called for a solution to the conflict in Syria that responds to "people's legitimate hopes for freedom, peace and justice" and favours the return of refugees.
Turning to South Sudan, Pope Francis urged rival leaders President Salva Kiir and rebel chief Riek Machar - who met recently at the Vatican - to sink their differences to pursure national reconciliation.
The pope noted how Easter, the holiest Christian festival, "makes us keep our eyes fixed on the Middle East, torn by continuing divisions and tensions".
Pope Francis touches his forehead as he celebrates Mass for the Passion of Christ, in St. Peter's Basilica, at the Vatican.