Newly installed Pope Leo XIV will hold a Mass with cardinals in the Sistine Chapel, a day after he was elected as the surprise choice to be the leader of the Catholic Church, becoming the first U.S. pontiff.

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.

The conclave to select the next pope has begun after Catholic cardinals from across the world filed into the Sistine Chapel Wednesday before sealing themselves inside.