Preparations for the papal conclave are ramping up at the Vatican on Friday as workers are beginning to install the ceremonial chimney on the roof of the Sistine Chapel.

Preparations are ramping up in Vatican City ahead of next week’s conclave, including the installation of the chimney on the roof of the Sistine Chapel to signal the selection of the next pope.

Four of the 133 cardinal electors who will pick Pope Francis's successor in a conclave starting Wednesday have not yet arrived in Rome, Vatican spokesman Matteo Bruni said Friday. He stressed that there are still 133 who will enter the Sistine Chapel because the announced absences are only those of the two cardinals who have manifested health problems: the Spaniard Antonio Canizares Llovera and John Njue of Kenya.