The Vatican on Monday announced the start of nighttime prayers for the health of Pope Francis in St. Peter's Square, and invited Romans and others to join in, as the 88-year-old pontiff battled a complex lung infection and complications.

Pope Francis has met senior colleagues in hospital to discuss work issues, the Vatican said on Tuesday, and an official said he was eating normally and moving around, even though he remains in critical condition with double pneumonia.

For centuries, one of the biggest taboos at the Vatican was openly discussing the pope's health. As leader of the world's 1.4 billion Catholics, the pope is a revered spiritual figure. Talking about his earthly health was profane.