Really horrible. Word is it was caused by workers doing renovations.

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Among the priceless works of art and the relics in the cathedral – a piece of the Crown of Thorns, a piece of the cross and two nails from the cross.

Update:

Some good news in the midst of the horrible fire:

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Catholics sing the rosary in prayer outside the fire. This is the “Hail Mary” and of course that’s for whom the cathedral is named, ‘Notre Dame’ = Our Lady.

Update:

Update:

Good news, they’ve saved the rest of the structure.