Vatican City, 12 April

The body of Pope Francis will be moved to St Peter's Basilica early Wednesday to lie in state for the Catholic faithful to pay their respects to the Argentine pontiff remembered for his humble style, concern for the poor and insistent prayers for peace.

Heads of state are expected for the funeral Saturday in St Peter's Square, but the three days of public viewing are largely for ordinary Catholics to grieve the 88-year-old pope, who died Monday after suffering a stroke.

Francis first lay in state in the Santa Marta Domus in a private viewing for Vatican residents and the papal household. Images released by the Vatican on Tuesday showed Francis lying in an open casket, wearing the traditional pointed headdress of bishops and red robes, his hands folded over a rosary. The Vatican's No 2, Cardinal Pietro Parolin, was pictured praying by Francis.

His body will be transferred Wednesday morning to St Peter's Basilica, which will be kept open until midnight on Wednesday and Thursday to allow the faithful to mourn. The public mourning period will end on Friday at 7 pm.

Once inside the basilica, his casket won't be put on an elevated bier — as was the case with past popes — but will just be placed on the main altar of the 16th-century basilica, simply facing the pews.

Italian police have tightened security for the viewing and the funeral, carrying out foot and horse patrols around the Vatican, where pilgrims continued to arrive for the Holy Year celebrations that Francis opened in December. The faithful who walk through St Peter's Holy Door are granted indulgences, a way to help atone for sins.

“For me, Pope Francis represents a great pastor, as well as a great friend to all of us,” said Micale Sales, visiting St Peter's Basilica from Brazil.

“I think he spread a positive message around the world, saying there shouldn't be any violence, there should be peace around the world,” said Amit Kukreja, from Australia.

The funeral has been set for Saturday at 10 am in St. Peter's Square, and will be attended by leaders including US President Donald Trump and Ukrainian President Volodmyr Zelenskyy.

Cardinals are continuing their meetings this week to plan the conclave to elect Francis' successor, make other decisions about running the Catholic Church as world leaders and the ordinary faithful grieve the pontiff's death.

History's first Latin American pontiff charmed the world with his humble style and concern for the poor but alienated many conservatives with critiques of capitalism and climate change.

He last appeared in public on Sunday with an Easter blessing and popemobile tour through a cheering crowd in St Peter's Square.

He had some reservations about looping through the square packed with 50,000 faithful, Vatican News reported on Tuesday, but overcame them — and was thankful that he had greeted the crowd. He died the next morning.

“The death of a pope is not a small thing, because we've lost our leader,” said Julio Henrique from Brazil. “But still, in a few days, we will have a new leader. So … the thing of hope remains. Who will assume Peter's throne?”