LARA LOGAN: The most important thing to every person at "60 MINUTES" is the truth, and today the truth is that we made a mistake. That's very disappointing for any journalist. It's very disappointing for me. Nobody likes to admit that they made a mistake, but if you do, you have to stand up and take responsibility and you have to say that you were wrong. And in this case, we were wrong. We made a mistake. And how did this happen? Well, Dylan Davies worked for the State Department in Libya, was the manager of the local guard force at the Benghazi Special Mission compound. He described for us his actions the night of the attack, saying he had entered the compound and had a confrontation with one of the attackers, and that he had seen the body of Ambassador Chris Stevens in a local hospital. And after our report aired, questions were raised about whether his account was real, after an incident report surfaced that told a different story about what he'd done that night. He denied that report and said that he told the FBI the same story he told us. But what we now know is that he told the FBI a different story from what he told us. That's when we realized that we no longer had confidence in our source, and that we were wrong to put him on air, and we apologize to our viewers.