US Ambassador to Libya killed in attack

The United States' ambassador to Libya, Chris Stevens, has been confirmed dead along with three others following an attack by protesters on the US consulate in Benghazi, eastern Libya.

We look back on how the situation in Libya developed, from a popular uprising which led to a protracted and brutal civil war, western military intervention and the death of Colonel Gaddafi - and the instability that followed during the difficult transition to democracy.