Visitors wait in Saint Peter's Square during the second day of voting by cardinals to elect a new pope at the Vatican, March 13, 2013.

Black smoke emerges from the chimney on the Sistine Chapel as cardinals voted on the second day of the conclave to elect a pope in Saint Peter's Square at the Vatican, March 13, 2013.

Two nuns smile in Saint Peter's Square at the Vatican, March 13, 2013.

People crowd Saint Peter's Square to await the sight of smoke from the chimney above the Sistine Chapel, March 12, 2013.

Black smoke rises from the chimney on the roof of the Sistine Chapel in the Vatican City indicating that no decision has been made after the first day of voting for the election of a new pope, March 12, 2013.

The crowd waits during the conclave in Saint Peter's Square at the Vatican, March 12, 2013.

Police officers are seen outside Saint Peter's Square, March 11, 2013.

A view of the balcony on the facade of Saint Peter's Basilica where the newly elected pope will make his first appearance to salute the cheering crowd, at the Vatican, March 11, 2013.

Reuters photographers Dylan Martinez (R) and Tony Gentile test a 1200-1700mm super-telephoto zoom lens, trained on the balcony of Saint Peter's Basilica where a new pope will appear after his election, a day before the beginning of the conclave at the Vatican, March 11, 2013.

Visitors line up as they wait their turn to enter Saint Peter's Basilica at the Vatican, Monday, March 11, 2013.

Saint Peter's Basilica at the Vatican is silhouetted during sunset in Rome, March 11, 2013.

Saint Peter's Square is seen from the dome of Saint Peter's Basilica at the Vatican, March 11, 2013.

Pilgrims carry a cross on Saint Peter's Square at the Vatican, March 11, 2013.