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.

Black smoke has poured out of the Sistine Chapel chimney, indicating no pope was elected on the first ballot of the conclave to choose a new leader of the Catholic Church.

The Sistine Chapel, a sacred room in the Apostolic Palace in Vatican City, is one of the most famous chapels in the world—and this week, cardinals from around the world will gather inside to choose a new pope.