What exactly happened that night is still a mystery. Libyans have pointed fingers at Ansar al-Sharia, a hard-line Islamist group with al Qaeda sympathies, if not ties. Ansar al-Sharia has denied involvement, but some of its members were spotted at the consulate.
The document also suggests that the U.S. consulate had asked Libyan authorities on Sept. 9 for extra security measures in preparation for Stevens' visit, but that the Libyans had failed to provide promised support.
"On Sunday, September 9, 2012, the U.S. mission requested additional police support at our compound for the duration of U.S. ambassador Chris Stevens' visit. We requested daily, twenty-four hour police protection at the front and rear of the U.S. mission as well as a roving patrol. In addition we requested the services of a police explosive detection dog," the letter reads.
"We were given assurances from the highest authorities in the Ministry of Foreign Affairs that all due support would be provided for Ambassador Stevens' visit to Benghazi. However, we are saddened to report that we have only received an occasional police presence at our main gate. Many hours pass when we have no police support at all."
The letter concludes with a request to the Libyan Ministry of Foreign Affairs to look into the incident of the policeman conducting surveillance, and the absence of requested security measures. "We submit this report to you with the hopes that an official inquiry can be made into this incident and that the U.S. Mission may receive the requested police support," the letter reads.
A number of other documents were found on the floor inside the TOC building. They are partly covered with ash, but legible.
A second letter is addressed to Benghazi's police chief and also concerns the police surveillance of the U.S. consulate on the morning of Sept. 11. The letter also requests an investigation of the incident, and states that the consulate "takes this opportunity to renew to the Benghazi Police the assurances of its highest consideration and hopes for increased cooperation." Benghazi's head of police, Brigadier Hussain Abu Hmeidah, was fired by the government in Tripoli one week after the consulate attack. However, Abu Hmeidah refused to step down and is still serving as the head of police. He is currently on sick leave, according to his office manager, Captain Seraj Eddine al-Sheikhi, and was unavailable for comment.
The man who officially was appointed to succeed Abu Hmeidah as Benghazi's police chief, Salah Doghman, said in a Sept 19 interview with Reuters: "This is a mess ...When you go to the police headquarters, you will find there no police. The people in charge are not at their desks. They have refused to let me take up my job."
The concerns about police surveillance exhibited in the letters to the Ministry of Foreign Affairs and the Benghazi police chief cast further doubt on early reports that a spontaneous protest was to blame for the attack on the U.S. consulate -- reports that the State Department has disavowed. They also appear to contradict an Oct. 9 State Department briefing on the consulate attack, during which a senior State Department official claimed that there had been no security incidents at the consulate that day. "Everything is calm at 8:30 p.m," the official said. "There's nothing unusual. There has been nothing unusual during the day at all outside."
These letters were found a month and a half after the attack, despite a visit to the compound by FBI investigators. Other documents found at the TOC building include a printout of an unclassified Sept. 9 email between Stevens and David McFarland, the head of the U.S. Embassy's political and economic section, inquiring about meetings for the ambassador's upcoming visit; telephone numbers and names of embassy staff; and a hotel bill from Stevens' 2011 stay at the Tibesti Hotel in Benghazi.
The continued threat to U.S. personnel in Benghazi may be the reason these documents escaped the FBI's attention. With suspected militants still roaming the streets, FBI investigators only had limited time to check the consulate compound. According to a Benghazi resident who resides near the consulate, the FBI team spent only three hours examining the compound.
The FBI declined to comment, citing the ongoing investigation.