Russian authorities often accused Khattab , al-Walid and other Arabs fighting in Chechnya , of involvement in terrorism . According to the FSB , Al-Walid was responsible for several terrorist attacks , including the 1999 apartment bombings , the 2002 Kaspiysk bombing , and planned but never executed bacteriological attacks on Russia . He and Shamil Basayev were also accused of organizing the suicide-bombing of the Chechen Republic 's Government headquarters in Grozny on 27 December 2002
1999 apartment bombings
Russian apartment bombings
Abu al-Walid