Bahrain's King Hamad bin Isa Al Khalifa and Qatar's Emir Sheikh Hamad bin Khalifa Al Thani left Riyadh yesterday evening; and Vice President of the United Arab Emirates, Prime Minister and Ruler of Dubai Sheikh Mohammed bin Rashid Al Maktoum left here today, after their participation in the 3rd Arab Economic and Social Development Summit. At Riyadh Air Base Airport, they were seen off by a number of officials. --More