This document is a supplement titled 'September Terror' from the 'Lubyanka Vector' report, detailing an independent investigation into the 1999 Russian apartment bombings in Moscow and Volgodonsk. It explores allegations of FSB involvement, particularly through the 'Perovsky trail' and the criminal activities of Max Lazovsky, who is described as an FSB-linked operative. The report highlights the Ryazan incident, questioning the 'training exercise' claim by analyzing technical mock-up details of the bomb, and discusses Achimez Gochiyayev’s written testimony that he was framed by an FSB associate. Key figures such as Mikhail Trepashkin and the Sergei Kovalyov Commission are featured for their roles in uncovering procedural discrepancies and early warnings of the bombings published in the media. The text also documents the systematic arrests or deaths of various witnesses, suspects, and investigators, including Yushenkov and Shchekochikhin, suggesting a pattern of suppression surrounding the case.