Pope Francis has received high flows of oxygen after suffering a respiratory crisis but had a peaceful night in hospital, the Vatican said.

“The night passed quietly, the pope rested,” the Holy See Press Office said in a brief statement early Sunday morning, without offering details on his latest condition.

Francis remains in “critical” condition and developed an “asthmatic respiratory crisis” on Saturday, the Vatican said earlier.

The Vatican said Francis will remain in hospital following his pneumonia diagnosis in both lungs and did not deliver the weekly Angelus prayer Sunday – for only the third time in his almost 12-year papacy.

Vatican sources meanwhile said that the pope was receiving additional oxygen and that the results of further tests would be known later.

The 88-year-old pontiff said his treatment continues and thanked medical staff for their dedication in the text of Sunday’s sermon, which was sent to the press in advance.

“I am confidently continuing my hospitalization at the Gemelli Hospital, carrying on with the necessary treatment; and rest is also part of the therapy!” the advance prayer text reads.

The pope also mentions the third anniversary of the war against Ukraine, while praying for the “gift of peace in Palestine, Israel and throughout the Middle East, Myanmar, Kivu and Sudan.”

The pope’s condition “also required the application of oxygen at high flows,” the Vatican said in Saturday’s update about the ailing pontiff.

While Francis “continues to be alert and spent the day in an armchair,” he is “in more pain than yesterday,” it added.

He also received blood transfusions to treat anemia, according to the statement.

“I am confidently continuing my hospitalization at the Gemelli Hospital, carrying on with the necessary treatment; and rest is also part of the therapy!” the advance prayer text reads.

The pope also mentions the third anniversary of the war against Ukraine, while praying for the “gift of peace in Palestine, Israel and throughout the Middle East, Myanmar, Kivu and Sudan.”

The pope’s condition “also required the application of oxygen at high flows,” the Vatican said in Saturday’s update about the ailing pontiff.

While Francis “continues to be alert and spent the day in an armchair,” he is “in more pain than yesterday,” it added.

He also received blood transfusions to treat anemia, according to the statement.