The gatherings were held on January 8 and 9 under the auspices of Iran's cultural attaché offices in those three countries.
The Unity Week is annual occasion celebrated by Shiite and Sunni Muslims as a sign of solidarity among different Islamic schools of thought.
A same conference was also held in the Iranian capital of Tehran from January 7 to 9.
The 28th Islamic Unity Conference was organized by Tehran-based World Forum for Proximity of Islamic Schools of Thought (WFPIST).
Titled “Unified Islamic Ummah: Challenges and Strategies”, the international conference brought together some 1300 Islamic scholars and intellectuals from 69 countries.
Attendees at the event included educated Muslim figures, ministers of Islamic countries, clerics, scholars and representatives of scientific and cultural circles from Iran and across the world.