libya east of the country. among the dead was a u.s. ambassad ambassador. >> it's the focus of foreign policy debates. a cnn investigation goes in search of the truth about benghazi. arwa damon talks with a person of interest who says u.s. officials have never questioned him. watch this. >> translator: that night when did you arrive and what did you see? >> translator: this is a journalists interview or an interrogation? >> translator: it's an interview. when we we drew and they were smohooting with medium gun and people panicked, we tried to control traffic. >> translator: did anyone from the american or libya government