 Complete the following phrase:  The Shahidka, commonly called the Black widows are a group of Islamist Chechen separatist suicide bombers. Khava Barayeva blew herself up at a Russian Army outpost on June 7, 2000. In 2001, Aiza Gazuyeva killed Russian general Gaidar Gadzhiyev in a suicide bombing, the first female suicide bomber of the Chechen insurgency. The group carried out the Moscow theater hostage crisis and some were involved in the Beslan school siege. A bombing that killed 10 people at Rizhskaya metro station in Moscow was thought to be carried out by a woman who was identified as a Beslan school captor. The 2004 Russian aircraft bombings are believed to be carried out by female bombers. Two of the perpetrators of the 