World Leaders Pay Their Respects to Saudi King Abdullah in Riyadh

U.S. President Barack Obama and first lady Michelle Obama are greeted by Saudi Arabia's King Salman (R) as they arrive at King Khalid International Airport in Riyadh, Jan. 27, 2015.

French President Francois Hollande offers condolences to Saudi King Salman following the death of Saudi King Abdullah, in Riyadh, Jan. 24, 2015.

Britain's Prince Charles and Prime Minister David Cameron arrive to offer condolences following the death of Saudi King Abdullah in Riyadh, Jan. 24, 2015.

Lebanese Prime Minister Tammam Salam, right, gives his country's condolences for Saudi King Abdullah, who died early Friday at age 90, to the newly enthroned King Salman, in Riyadh, Saudi Arabia, Jan. 24, 2015.

Turkey's President Recep Tayyip Erdogan arrives to Riyadh, Saudi Arabia, to give his country's condolences for King Abdullah, Jan. 24, 2015.

Egyptian President Abdel-Fattah el-Sissi is greeted by the Mayor of Riyadh, Prince Turki as he arrives to give his country's condolences for King Abdullah, Jan. 24, 2015.