Dylan Davies, a security officer hired to help protect the United States Special Mission in Benghazi, Libya, gave the F.B.I. an account of the night that terrorists attacked the mission on Sept. 11, 2012 that contradicts a version of events he provided in a recently published book and in an interview with the CBS News program “60 Minutes.”

Mr. Davies told the F.B.I. that he was not on the scene until the morning after the attack.

The information he provided in an F.B.I. interview was described Thursday by two senior government officials as completely consistent with an incident report by the Blue Mountain security business, which had been hired to protect United States interests in Benghazi. The officials who spoke said they had been briefed on the government investigation.

Mr. Davies, who worked for Blue Mountain, has disavowed the incident report, saying in an interview last week with the online magazine The Daily Beast that he did not write it and had never even seen it, and was not responsible for the account of events it contained.

The contradictions between the versions offered in the incident report and what was presented on television and in the book, “The Embassy House” — Mr. Davies appeared on the program and wrote the book under the pseudonym Morgan Jones — have led to questions about how “60 Minutes” came to present Mr. Davies as a credible source for its extensive report on the Benghazi incident.