Thousands of people gathered in St. Peter’s Square Monday evening to pray for an ailing Pope Francis, expressing sorrow for his suffering, hope for his recovery and gratitude for his efforts to steer the Catholic Church in new directions.

Pope Francis, who is in critical condition in hospital battling double pneumonia, rested well throughout the night, the Vatican said on Tuesday. The 88-year-old pope was admitted to Rome's Gemelli hospital on February 14 with a serious respiratory illness that has since triggered other health problems.

Pope Francis was found to have pneumonia in both his lungs Tuesday and his condition remains "complex," the Vatican said in a health update on the 88-year-old pontiff who was hospitalized last week. The big picture: The pope was admitted to Rome's Agostino Gemelli Hospital on Friday with bronchitis symptoms and his treatment was changed after doctors found he had a polymicrobial infection of the respiratory tract.