Past bombings on the Moscow subway system:
Aug. 31, 2004: Female suicide bomber blows herself up outside the Rizhskaya station, killing 10 people. A little-known Islamic group supporting Chechen rebels claims responsibility. The woman’s identity was never confirmed.
Feb. 6, 2004: A suicide bomber from the North Caucasus sets off explosives during morning rush hour on a train traveling between the Avtozavodskaya and Paveletskaya stations, killing more than 40 people and wounding more than 100.
Feb. 5, 2001: Explosives placed under a bench on the platform of the Belorusskaya station go off, wounding 15 people.
Jan. 1, 1998: Homemade bomb explodes in vestibule of Tretyakovskaya station, wounding three people.
June 11, 1996: Homemade bomb explodes on train in tunnel between the Tulskaya and Nagatinskaya stations, killing four people.