World leaders arrive and pay respects to Pope Francis ahead of funeral

World leaders arrive and pay their respects at the coffin of Pope Francis, who died on April 21 aged 88. The funeral sets off the first of nine days of official Vatican mourning for Francis, who took over following the resignation of Pope Benedict XVI in 2013. After the mourning, cardinals will gather for the conclave to elect a new pope to lead the world's 1.4 billion Catholics.