Pope Francis suffered two episodes of acute respiratory failure Monday, the Vatican said, a fresh setback in the worst health crisis of his papacy.

ROME (AP) — Pope Francis suffered two new acute respiratory crises Monday and was put back on noninvasive mechanical ventilation, in another setback to his battle to fight pneumonia, the Vatican said.

Pope Francis suffered two episodes of "acute respiratory insufficiency" on Monday, the Vatican said, in another setback for the 88-year-old pontiff as he continues to battle double pneumonia. Francis has been in Rome's Gemelli Hospital since February 14,