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In page Catacombs of Paris:

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The need to eliminate Les Innocents gained urgency from May 31, 1780, when a basement wall in a property adjoining the cemetery collapsed under the weight of the mass grave behind it. The cemetery was closed to the public and all intra muros (Latin: "within the [city] walls"[1]) burials were forbidden after 1780. The problem of what to do with the remains crowding intra muros cemeteries was still unresolved.[citation needed]