Nigerian cardinal John Onaiyekan attends a mass at the St Peter’s basilica before the conclave on March 12, 2013 at the Vatican. Cardinals moved into the Vatican today as the suspense mounted ahead of a secret papal election with no clear frontrunner to steer the Catholic world through troubled waters after Benedict XVI’s historic resignation.The 115 cardinal electors who pick the next leader of 1.2 billion Catholics in a conclave in the Sistine Chapel will live inside the Vatican walls completely cut off from the outside world until they have made their choice. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS,GABRIEL BOUYS/AFP/Getty Images)