I never knew about this until it was on the Bulgarian news, so I looked it up on the Internet and found out more about it. Bulgarian really do take Easter really seriously and it is almost on a par with Christmas.
Bulgaria Church Delegation to Bring Holy Easter Fire from Jerusalem
A delegation of clergymen from the Bulgarian Orthodox Church is expected to land at Sofia Airport in the evening on Holy Saturday bringing the Holy Easter Fire from Jerusalem. According to the Orthodox Church, its appearance cannot be explained scientifically. Thus, the Holy Easter Fire is believed to be one of the great miracles of the world. It appears after the prayer of the Orthodox Patriarch of Jerusalem.
The transfer of the Holy Fire from Jerusalem to Bulgaria is taking place for the fifth consecutive year. The fire will be brought to the St. Alexander Nevksi Cathedral in Sofia thirty minutes before midnight on Saturday.