 De Marchi wrote that the prediction of an unspecified "miracle", the abrupt beginning and end of the event, the varied religious backgrounds of the observers, the sheer numbers of people present, reports of sightings by people up to away, and the lack of any known scientific causative factor make a mass hallucination or mass hysteria unlikely.De Marchi concludes that "given the indubitable reference to God, and the general context of the story, it seems that we must attribute to Him alone the most obvious and colossal miracle of history.