Basayev was considered by some to be the undisputed leader of the radical wing of the Chechen insurgency . He ordered the Beslan school massacre and was responsible for numerous terrorists attacks on security forces in and around Chechnya and the 2002 Moscow theater hostage crisis . ABC News described him as " one of the most-wanted terrorists in the world . " Basayev was killed by an explosion on 10 July 2006 . Controversy still surrounds who is responsible for his death , with Russian authorities claiming he was killed in an assassination by the FSB and the Chechen separatists claiming he died in an accidental explosion
Moscow theater hostage crisis
Moscow theater hostage crisis
Shamil Basayev