Two blasts ripped through Lubyanka and Park Kultury Moscow subway stations early on Monday morning.
At least 37 were killed and 62 injured during the attacks, law enforcement agencies announced.
This was the first terrorist attack on the Russian capital over the last six years. Here is a factbox over the main terrorist attacks in Moscow's subway stations.
A blast rocked the area between Rizhskaya metro station and a shopping center on August 31, 2004, at 8:15 p.m., killing 10 people and wounding more than 40.
A female suicide bomber was blamed for the blast. She failed to approach a group of police near the entrance of the subway station and instead detonated the bomb nearby.
The responsibility for the terrorist act near Rizhkaya station was assumed by the Islambuli brigades, an Islamist movement, considered to be part of an international terrorist organization. A message saying the attack was an act of support to Chechen Muslims, appeared on an Islamist site later.
Militant Nikolai Kipkeyev, an accomplice to the suicide bomber, was killed during the blast. The investigation found he was the tutor of the female suicide bomber. Kipkeyev had a fake passport and a cell-phone which helped law enforcement agencies detain three other members of the gang, among them a former Russian Defense Ministry serviceman, who had earlier accepted Islam. All of them were sentenced to life in prison.
On February 6, 2004, a bomb detonated during rush hour, 40 people were killed and 134 injured. The blast occurred in the tunnel between the Avtozavodskaya and Paveletskaya stations.
The train engineer, Vladimir Gorelov, was awarded an Order of Courage for his professional merits during the emergency which saved the life of many people.
On February 5, 2001, an explosive device hidden in a small bag blew up at Belorusskaya station at 6:45 p.m., injuring 15 people.
On January 1, 1998, an explosion ripped through Tretyakovskaya station in central Moscow. The train engineer found a small bag with batteries and wires. The bomb detonated at 9:39 a.m., injuring only three people.
A bomb exploded in the tunnel between the Tulskaya and Nagatinskaya stations ahead of the presidential elections on June 11, 1996, at 9:10 p.m. The shock wave from the blast blew out windows in the passenger cars and smoke entailed. Three people were killed and 16 injured.
A bomb exploded in a tunnel between the Pervomayskaya and Izmailovskaya subway stations on January 8, 1977, at 5:33 p.m. Many adults and children, returning from festive parties were killed in the blast.
Three Armenians of an underground political organization were blamed for the accident. They were sentenced to the death penalty.
MOSCOW, March 29 (RIA Novosti)