India, March 4 -- Pope Francis was put back on "non-invasive mechanical ventilation" after suffering two new episodes of difficulty in breathing, the Vatican said on Monday.

"Today, the Holy Father suffered two episodes of acute respiratory insufficiency, caused by a significant accumulation of endobronchial mucus and consequent bronchospasm. Two bronchoscopies were therefore performed, with the need to remove large secretions," the Vatican said in its latest update.

"In the afternoon, non-invasive mechanical ventilation was resumed. The Holy Father remained alert, oriented and cooperative at all times. The prognosis remains guarded," the statement added.

The Argentine Pope spent his Sunday without an oxygen mask. He participated in ma...