Apparently the man, a housekeeping attendant at the nearby Sancto Spirito Hospital, may have been involved in a “serious family quarrel” before dousing himself with flammable liquid at the end of the Colonnade, near the corner of Piazza Pio XII.
According to the Vatican Press Office, his condition is “severe.” He might have died at the scene, though, but for the quick intervention of a Jesuit priest who was arriving for his job at the Curia, and who threw his jacket over the man’s burning torso. There followed two Vatican Inspectors, who each had a blanket and fire extinguisher in his car—and they were able to suppress the flames, although they suffered burns to the hands and smoke inhalation, which required treatment at the local hospital.
The Daily Mail has posted a series of copyrighted photos taken immediately after the fire was extinguished. You can see the photos here.