The casing, known as a reliquary, was snatched on Wednesday from an altar dedicated to the Polish pope, who died in 2005 after a 27-year reign.
A sacristan who was closing the cathedral for the night discovered the theft of the reliquary, which encased a vial holding a few drops of blood.
Relics, which Catholics venerate as they pray to the saint, are usually pieces of a saint’s body or clothing.
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Source: ABS CBN