Bells toll to signal the start of the procession
Pope Francis' coffin will be brought from St. Peter's Basilica to the front of the altar in the square.
Mourners were instructed to refrain from waving flags or banners during the procession.

Francis died on April 26 at 88 years old.
Pope Francis, the 266th pope of the Roman Catholic Church, was buried Saturday, April 26 at the Basilica of Saint Mary Major after dying one week ago at 88 years old.
Francis, who took his name after Saint Francis of Assisi, was known for his outreach to the poor and those in poverty and that will be reflected in his minimalist burial at Saint Mary Major. He is the first pope to be buried outside the Vatican in over a century and the first to be buried at Santa Maria Maggiore in more than 300 years.
Tap on the blue circle to take a look at photos from the funeral for Pope Francis.
Pope Francis' coffin will be brought from St. Peter's Basilica to the front of the altar in the square.
Mourners were instructed to refrain from waving flags or banners during the procession.
President Donald Trump has arrived at St. Peter's Square alongside First Lady Melania Trump to pay their respects and say goodbye to Pope Francis.
Former President Joe Biden and his wife, Jill, are also in attendance.
Donald Trump paid his respects to Pope Francis at his closed coffin inside St. Peter's Basilica before making his way outside to take his seat with many other world leaders and dignitaries.
World leaders and global dignitaries, along with tens of thousands of mourners, are arriving in St. Peter's Square as the funeral of Pope Francis is set to begin at 10 a.m. at the Vatican.
Heavy security can also be seen as thousands of Italian police and law enforcement are out in force Saturday morning, watching over the gathering crowds in advance of the start of the funeral.
Tap on the blue circle to take a look at photos from the funeral for Pope Francis.