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Crowds were expected for Pope Benedict XVI's last Sunday prayers, as cardinals from around the world began arriving in Rome to elect his successor and the Vatican battled reports of high intrigue.
The 85-year-old pope will read out his traditional Angelus prayer and messages to Catholic faithful in different languages from the window of his apartment high above the crowd in St Peter's Square.
The prayer begins at 1100 GMT and usually lasts only a few minutes.
City authorities have announced tight security in and around the Vatican, with more than 100 police officers and snipers on surrounding buildings, as well as two field hospitals and hundreds of volunteers to help pilgrims.
The security is being seen as preparation for the pope's final general audience in St Peter's on Wednesday, when bigger crowds are expected.
City officials are expecting more than 100,00 people on Sunday and around 200,000 people on Wednesday.
The leader of the world's 1.2 billion Catholics has said he will step down on Thursday because he no longer has the strength of mind and body to carry on.
The announcement last week shocked the world and brings Benedict's pontificate to an abrupt end after eight years dominated by the scandal of abuses by priests and his efforts to counter rising secularism in the West.
Benedict will be only the second pope to resign of his own free will in the Church's 2,000-year history and the first to do so since the Middle Ages.
-- Rumour mill --
The momentous decision has also set off a rumour mill, with some Italian media saying his health may be far worse than the Vatican ever revealed and others saying an explosive report into the "Vatileaks" scandal may be to blame.
The Vatican's Secretariat of State -- effectively the government of the Catholic Church -- took the unusual step on Saturday of issuing a formal statement condemning "completely false news stories" doing the rounds.
The Panorama news weekly and the Repubblica daily said that a report by a committee of cardinals into the leaks of confidential papal papers last year had uncovered allegations of intrigue, corruption and blackmail in the Vatican.
Following Benedict's resignation, Cardinal Tarcisio Bertone who occupies a post known as the "Camerlengo Cardinal" (Chamberlain Cardinal) will take over interim powers of managing the Church before a new pontiff is elected.
Catholics around the world have been divided over the resignation, with some criticising it as a break with tradition that sounds like an admission of defeat and others welcoming it as a way of breathing new life into the Church.
No clear favourites have emerged to succeed Joseph Ratzinger but many observers say the cardinals who make the choice may plump for a much younger candidate who is a more pastoral figure than the academic Benedict.
A series of meetings of cardinals starting Friday will determine the date of the start of the conclave to elect a new pope, with the Vatican hinting that it could be brought forward to early March since there is no papal funeral.
Conclaves can last for days before a candidate wins a two-thirds majority.
The Vatican has said Benedict will retire initially to the papal summer residence of Castel Gandolfo near Rome for the next two or three months while renovations are being carried out in a former monastery inside the Vatican.
Once he moves to the monastery on a hilltop over St Peter's, the Catholic Church will be in an unprecedented and delicate situation of having a pope and his predecessor living virtually side by side within the Vatican walls.
Benedict has said he will live "hidden from the world" but Vatican spokesman Federico Lombardi has said he could provide "spiritual guidance" to his successor and will likely continue to publish his theological research.