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Christian Orthodox worshippers hold up candles during the ceremony of the "Holy Fire" as thousands gather in the Church of the Holy Sepulchre in Jerusalem's Old City, on April 15, 2017, during Orthodox Easter ceremonies.
The ceremony celebrated in the same way for eleven centuries, is marked by the appearance of "sacred fire" in the two cavities on either side of the Holy Sepulchre. / AFP PHOTO / MENAHEM KAHANA (Photo credit should read MENAHEM KAHANA/AFP via Getty Images)