On behalf of the Custodian of the Two Holy Mosques King Salman bin Abdulaziz Al Saud, Crown Prince Mohammed bin Nayef bin Abdul Aziz, the Deputy Prime Minister and Minister of Interior, as well as the Chairman of the Higher Hajj Committee and the Chairman of the Higher Supervision Committee of the Custodian of the Two Holy Mosques Institute for Hajj and Umrah Research, here this evening opened the seventeenth scientific meeting on Hajj and Umrah and visit research. A speech ceremony was held on the occasion. The crown prince received commemorative gifts on the occasion. The event was attended by a number of princes and officials.