Four Americans, including Ambassador Christopher Stevens, were killed in the attack on the U.S. Consul compound in Bengazi, Libya on Sept. 11th, 2012. (ABDULLAH DOMA/AFP/Getty Images)

Bengazi Witness: ‘We’re Here To Kill Americans’

A security guard who witnessed last year’s attack against a U.S. diplomatic team is speaking publicly for the first time to CBS ’60 Minutes.’