The details of the September 11 attack that killed four Americans at the U.S. consulate in Benghazi are still murky, as is the role of U.S. diplomats in the region.
One worrying link could connect U.S. Ambassador Chris Stevens to rebels in Syria.
In March 2011 Stevens became the official U.S. liaison to the al-Qaeda-linked Libyan opposition and began coordinating U.S. assistance to the rebels.
The top military commander of the rebels, Abdelhakim Belhadj, was the leader of the pro-al-Qaeda Libyan Islamic Fighting Group (LIFG).
After Gaddafi fell the LIFG disbanded and some of the fighters joined the amorphous group Ansar al-Shariah (Soldiers of Shariah), which reportedly participated in the attack that took Stevens' life.