VATICAN CITY, VATICAN - MARCH 12: Nuns from the 'Instituto Serve del Signore, E Della Vergine Di Matara' sing hymns under the colonnade in St Peter's Square on March 12, 2013 in Vatican City, Vatican. Pope Benedict XVIâs successor is being chosen by the College of Cardinals in Conclave in the Sistine Chapel. The 115 cardinal-electors, meeting in strict secrecy, will need to reach a two-thirds-plus-one vote majority to elect the 266th Pontiff. (Photo by Dan Kitwood/Getty Images)
This picture made available Tuesday, March 12, 2013 by the Vatican newspaper L'Osservatore Romano shows where the cardinals will be sitting inside the Sistine Chapel during the conclave voting, at the Vatican.
Black smoke signals no pope elected at first conclave vote
A man holds a banner reading 'Francesco I Papa' in front of Saint Peter's Square at the Vatican March 11, 2013. Roman Catholic Cardinals will begin their conclave inside the Sistine Chapel on Tuesday to elect a new pope. REUTERS-Alessandro Bianchi (VATICAN - Tags: RELIGION)