St. Peter’s fills for Pope Francis installation

Nuns line up for the inaugural Mass of Pope Francis, at St. Peter’s Square at the Vatican, early Tuesday, March 19, 2013. AP

VATICAN CITY  — Thousands of people are pouring into St. Peter’s Square to witness the official start of the papacy of the first pope from the New World.

The blue and white flags from Pope Francis’ native Argentina fluttered Tuesday above the crowd that Italian media estimate could reach 1 million. Emergency crews set up barricades for nearly a mile (two kilometers) along the main boulevard leading to the square to control the masses.

The installation Mass is simpler than the 2005 ceremony for Pope Benedict XVI in keeping with Francis’ style, but still grand enough to draw 132 official delegations and religious leaders from around the world, including the spiritual leader of the world’s Orthodox Christians who is attending for the first time since the two branches of Christianity split 1,000 years ago.