The Vatican has announced that Pope Francis' health status today, Tuesday, March 4, is "uncertain," although he is not on mechanical ventilation.

Pope Francis, batting double pneumonia in hospital, remained stable throughout the day on Tuesday and did not have any new respiratory crises, the Vatican said. Francis, 88, had suffered two episodes of what the Vatican described as "acute respiratory insufficiency" on Monday.

Pope Francis has remained stable after suffering two episodes of respiratory failure on Monday. In its nightly update, the Vatican said the Pope did not present any further episodes of respiratory failure or bronchospasm.