Catholic cardinals are gathering at the Vatican to elect the successor to Pope Francis, who died on April 21. Voting will take place in the Sistine Chapel, with ballots continuing in succession until any candidate secures two-thirds of the available votes.

Multiple rounds of voting likely will be required before a candidate emerges with the two-thirds majority required to become the next pope.

With the conclave underway, PBS News has a live video of the chimney on the Sistine Chapel as the world waits for white smoke that signals a successful vote for a new pontiff.