The State Department is now providing its most detailed account of the speed, severity and calculation behind last month's attack on the US mission in Benghazi, Libya. The House Oversight Committee will weigh in on security failings during a hearing later today.
The State Department is saying the attack was not a spontaneous off-shoot of protests, and that security personnel in Benghazi were outmanned – that no reasonable security presence could have fended off the assault. U.S. Ambassador Christopher Stevens and three other Americans were killed in the attack.
CNN senior international correspondent Arwa Damon helps us piece together what investigators say happened.