Complete the following sentence: 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. <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>i<unk>