[2] The official investigation concluded that it was organized by the same group as the February 2004 Moscow Metro bombing, as well as four previous terrorist attacks on bus stops in Voronezh, southern Russia, in 2004–2005.

[4] Kipkeyev, the head of an Islamic militant group Karachay Jamaat (also known as «Muslim Society No 3»[4]) from the Republic of Karachay–Cherkessia, had accompanied an unidentified female suicide bomber who was to blow herself up on a Moscow metro train.

[6] In May 2005, Tambiy Khubiyev and Maksim Panaryin (from Karachay-Cherkessia[7]) along with Murat Shavayev (a native of Kabardino-Balkaria[7]) were arrested by Russian law enforcement agencies in connection with terrorist attacks in Moscow, Voronezh, and Krasnodar.

[3] Khubiyev confessed to organizing the bombings near Avtozavodskaya and Rizhskaya subway stations in Moscow[3] and a series of explosions in Krasnodar in August 2003.

Furthermore, Khubiyev linked Shavayev to the Rizhskaya station bombing, stating that the latter had smuggled IED parts to Moscow prior to the attack.