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.