A new pope will be selected when a candidate gets a two-thirds-plus-one majority vote by the cardinal electors. White smoke will be sent up the chimney of the Sistine Chapel when that happens, to indicate a new pope has been chosen.

Cardinals returned to the Sistine Chapel on Thursday to resume voting for a new pope after the first conclave ballot failed to find a winner, sending billowing black smoke through the chapel chimney.

VATICAN CITY — Cardinals failed again Thursday morning to find a successor to Pope Francis, sending black smoke billowing up through the Sistine Chapel chimney after two more inconclusive rounds of conclave voting.