SARAJEVO, BOSNIA AND HERZEGOVINA - JUNE 10: Muslims observe Laylat al - Qadr (the night of power), which marks the first revelation of the Quran to the Prophet Muhammad at Gazi Husrev - bey Mosque in Sarajevo, Bosnia and Herzegovina on June 10, 2018. Laylat al - Qadr is one of the most important nights in Islamic calendar, as Muslims flock to the mosques and and perform the night long prayers..

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