Which world leaders are visiting Qatar to pay their condolences?

Leaders from around the world are visiting Qatar to offer condolences following the death of former Emir Sheikh Hamad bin Khalifa Al Thani, who died at age 74. Current Emir Sheikh Tamim bin Hamad Al Thani has been receiving dignitaries at the Lusail Palace since Monday. Visitors include the Crown Prince of Bahrain, the President of Egypt, the President of Syria, and other regional officials.