Vatican officials have said Pope Francis has developed pneumonia in both lungs, further complicating his recovery. The 88-year-old pontiff was hospitalized Friday after a weeklong bout of bronchitis worsened.

Pope Francis was in critical but stable condition Tuesday, with his blood parameters remaining stable and no new respiratory crises, as he worked from the hospital while battling double pneumonia, the Vatican said.

Pope Francis "rested well throughout the night" in the hospital, the Vatican says, and even met with Vatican officials to sign several documents linked to sainthood designations on Monday.