Responsibility
The two almost simultaneous crashes caused speculations about terrorism. President Vladimir Putin immediately ordered the Federal Security Service (FSB) to investigate the crashes. On 28 August 2004, the FSB had found traces of the explosive RDX in the remains of both planes. Itar-Tass news agency reported on 30 August 2004, "without a shadow of a doubt, the FSB security service said that "both airplanes were blown up as a result of a terrorist attack". A little known group called the Islambouli Brigades claimed responsibility; the truth of those claims remains uncertain. The Islambouli Brigades have also claimed that five of their members were on each plane; experts are skeptical about the possibility of (and the need for) so many terrorists on board.
The subsequent investigation found that the bombs were triggered by two female Chechen suicide bombers, Grozny residents Satsita Dzhebirkhanova (Siberia Airlines Flight 1047) and Amanta Nagayeva (Volga-AviaExpress Flight 1303). Nagayeva's brother had disappeared three years earlier and the family believed he was abducted by Russian forces. Chechen field commander Shamil Basayev took responsibility for the bombings in an open letter published on the Chechen separatists' websites on 17 September 2004. He claimed that the aircraft bombings cost him $4,000 U.S. dollars in total. He has also denied the Islambouli Brigade's claims.
The bombings followed the Moscow metro bombing which left 41 people dead in February 2004 and preceded other deadly attacks in Russia soon afterwards: on 31 August 2004 a bomb killed 10 at a Moscow subway station, and then the Beslan hostage crisis began on 1 September 2004 which would leave over 335 people dead, many of them children.
Read more about this topic: 2004 Russian Aircraft Bombings