Pope Francis is being treated with supplemental oxygen to assist him with breathing, the Vatican said Tuesday, a day after he suffered two episodes of acute respiratory failure. Francis is currently receiving oxygen again via a nasal tube,

The 88-year-old, who had part of one lung removed as a young man, experienced two acute respiratory crises on Monday.

Pope Francis suffered two episodes of acute respiratory insufficiency and went back on a ventilator as he remains hospitalized for double pneumonia, the Vatican said Monday night.