Thousands of Christian Orthodox worshippers gather at the Church of the Holy Sepulcher in Jerusalem's Old City to take part in the Holy Fire ceremony on April 15, 2017. /CFP Photo
Participants lit their candles with holy fire from what is believed to be Jesus' tomb. /CFP Photo
The tradition dates back 11 centuries ago, with Holy Fire considered a miracle occurring every year on Holy Saturday, the day before Easter Sunday. /CFP Photo
The church is believed to be built where Jesus Christ was crucified, buried and resurrected, and is regarded as one of the holiest sites in Christianity. /CFP Photo