Two explosions hit the Moscow subway system on Monday morning, killing at least 37 people.
The Emergency Situations Ministry said the first blast, which struck the Lubyanka station at 7:56 a.m. (0356 GMT), had killed at least 25 people and injured at least 10 others.
Shortly afterwards, an explosion hit another subway station, killing at least 12 people with 12 others injured at the Cultural Park subway station.
The following is a chronology of some major subway bombings in Moscow since 1998:
On Jan. 1, 1998 an abandoned handbag exploded on a subway platform in central Moscow, wounding three subway employees.
On Aug. 8, 2000 a blast tore through a busy central Moscow metro underpass during the evening rush hour, killing at least eight people and injuring 18 others.
On Feb. 5, 2001 a bomb exploded in Moscow's metro station Belorusskaya, injuring 10 people including two children.
On Feb. 6, 2004 at least 41 were killed and more than 130 others injured when a deadly blast ripped through a crowded metro car in the Russian capital during morning rush hour.