Pope Francis is resting and had a peaceful night, the Vatican said, after he suffered a sudden episode of respiratory difficulty and was put on a breathing machine on Friday.

“The night passed peacefully, the pope is resting”, the Holy See Press Office said in its latest update on the pope’s health on Saturday morning local time.

The episode of breathing difficulty on Friday was complicated by vomiting, some of which the pope aspirated, the Vatican said. Medical staff treated the aspiration issue before putting him on mechanical ventilation, it said. A Vatican source told CNN that Francis is not intubated, but he is wearing a mask.

The Vatican added that the pontiff “remained alert and oriented at all times.”

A spokesperson later noted that the pope is not considered out of danger at this point. The Vatican source told CNN that doctors expect to know more about his condition in the next 24-48 hours.

Francis was first admitted to Rome’s Gemelli Hospital two weeks ago, after being plagued by a string of lung-related medical struggles, including bronchitis and then pneumonia. His current hospitalization is his fourth, and now longest, stay since he became pope in 2013.

The pontiff has suffered from lung-related issues for much of his life. As a young man, he suffered from severe pneumonia and had part of one lung removed.

The Vatican has been releasing twice daily updates on the pope’s health. On Thursday, it said that Francis’ condition was “improving” but his prognosis remained unclear.

The Argentinian leader’s schedule has been cleared to accommodate his intensive medical treatment.

Earlier on Friday, the Vatican announced that the pope will not lead next week’s Ash Wednesday service, marking the start of Lent, for only the second time in his 12-year papacy. A cardinal is expected to lead the service instead.

On Friday night while praying for the pope, Argentinian Cardinal Victor Manuel Fernández said: “Certainly it is close to the Holy Father’s heart that our prayers be not only for him, but also for all those who, in this particular dramatic and suffering moment of the world, bear the heavy burden of war, sickness, and poverty.”