Pope Francis, who is being treated in hospital for double pneumonia, will not appear in public on Sunday to lead his usual prayer with pilgrims for a second consecutive week, the Vatican said.

LONDON — Vatican officials said late Tuesday that Pope Francis had developed pneumonia in both lungs, further complicating the pontiff’s recovery. The 88-year-old pope was hospitalized Friday after a weeklong bout of bronchitis worsened. On Monday, doctors said he had developed a mix of infections in his respiratory tract.