His Highness the Amir Sheikh Tamim bin Hamad Al-Thani participated with his brothers Their Majesties and Their Highnesses leaders of the Cooperation Council for the Arab States of the Gulf (GCC) and heads of delegations in the 43rd session of the Supreme Council summit, held today at King Abdul Aziz International Conference Center in Riyadh of the Kingdom of Saudi Arabia.The session was attended by a number of Their Excellencies members of the official delegation accompanying His Highness the Amir, and a number of Their Royal Highnesses Princes, and Their Excellencies members of the official accompanying delegations.It was also attended by HE GCC Secretary-General Dr. Nayef bin Falah Al Hajraf.