1.   After four Saudi citizens confessed to planting a bomb that killed five Americans in Riyadh last November, Saudi Arabia beheaded the four without letting U.S. investigators interview them.

2.   The four were beheaded in May, an event some speculate may have led to the latest bomb attack.

3.   The four were beheaded, apparently after a botched attempt by Russian security services to free them.

4.   The four were beheaded weeks later.

5.   The kidnappers had threatened to behead all four unless their jailed comrades were released.

6.   Those four were beheaded for the attack, which killed four Americans and two Indians.

7.   The four were beheaded in May for the bombing that killed five Americans and two Indians at a US Army training mission.