FBI investigators have finally been able to search the site in Benghazi, Libya, where Ambassador Chris Stevens and other US personnel were killed last month.

Anchor Marco Werman speaks with Washington Post reporter Michael Birnbaum, who himself gained access to the American diplomatic compound where the attack took place.

We also hear from Financial Times correspondent Borzou Daragahi about the the militant group Ansar al-Sharia suspected of being behind the attack.