Major terror attacks in Russia over the past 15 years:
— January 24, 2011: An explosion at the international arrivals hall at Moscow's Domodedovo airport kills at least 31 people, wounds over 140.
— October 19, 2010: Three suicide bombers attack the building of Chechnya's regional parliament, leaving six people dead and 17 wounded in a raid that defied Kremlin claims of stability in the region.
— March 29, 2010: Double suicide bombings on the Moscow subway kill 40, wound more than 100. A Chechen rebel warlord claims responsibility for the attack.
— November 27, 2009: A bombing of a high-speed Moscow-to-St.Petersburg train kills 28 and wounds nearly 100. Chechen rebels claim responsibility.
— Aug. 17, 2009: A suicide attacker rams a truck loaded with explosives into a police station in the city of Nazran the province of Ingushetia, killing 25 and wounding more than 160 people. Chechen rebels claim responsibility.
— Nov. 6, 2008: A suicide bomber hits a bus in Vladikavkaz in the province of North Ossetia killing 12.
— Oct. 13, 2005: Islamic militants launch a series of attacks on police in Nalchik, capital of the tense Kabardino-Balkariya republic near Chechnya. Chechen rebels claim credit for the attack, in which 139 people were killed, including 94 militants.
— Sept. 1, 2004: About 30 Chechen militants seize a school in the southern town of Beslan and take hundreds of hostages — a siege that ended in a bloodbath two days later. More than 330 people, about half of them children, are killed.
— Aug. 31, 2004: A suicide bomber blows herself up outside a Moscow subway station, killing 10 people. An Islamic group supporting Chechen rebels claims responsibility.
— Aug. 24, 2004: Two female suicide bombers bring down two Russian airliners that took off from Moscow's Domodedovo airport, killing 90 people. Chechen rebels claim responsibility for the attacks.
— May 9, 2004: A bomb rips through a stadium in the Chechnya's provincial capital, Grozny, during a Victory Day ceremony, killing 24 people including Akhmad Kadyrov, the Kremlin-backed regional president.
— Feb. 6, 2004: A suicide bomber strikes a subway car in Moscow during rush hour, killing 41 people and wounding more than 100.
— June 21-22, 2004: Islamic militants attack police headquarters and other government buildings in the city of Nazran in Ingushetia, killing more than 90 people — mostly police officers — and wounding more than 100. Chechen insurgents claim responsibility.
— Dec. 5, 2003: A suicide bombing on commuter train in southern Russia kills 44 people, two days before Russian parliamentary elections.
— Aug. 1, 2003: A suicide bomber rams truck filled with explosives into a military hospital near Chechnya, killing 50 people, including Russian troops wounded in Chechnya.
— July 5, 2003: Double suicide bombing at a Moscow rock concert kills the female attackers and 15 other people.
— June 5, 2003: Female suicide attacker detonates bomb near a bus carrying soldiers and civilians to a military air base near Chechnya, killing at least 16 people.
— May 12, 2003: Suicide bomber using a truck kills at least 60 at a government compound in northern Chechnya.
— Dec. 27, 2002: Suicide truck-bomb attack destroys headquarters of Chechnya's Moscow-backed government in the provincial capital, Grozny, killing 72 people.
— Oct. 23, 2002: Chechen militants take 800 people hostage at a Moscow theater. Two days later, Russian special forces storm building and 129 hostages and 41 Chechen fighters are killed, mostly from effects of narcotic gas Russian forces use to subdue the attackers.
— August 1999: Four apartment building bombings kill about 300 people in Moscow and two other Russian cities. The Kremlin names the attacks as a key reason for sending troops back into Chechnya on September 30, 1999.
— Jan. 9, 1996: Several hundred Chechen rebels seize a hospital in the town of Kizlyar near Chechnya during the first separatist war in Chechnya, taking some 3,000 people hostage. At least 40 people were killed. The attackers retreated after battling Russian troops for several days.
— June 14, 1995: About 200 Chechen fighters seize a hospital in Budyonnovsk near the Chechen border during the first Chechen war in Chechnya. The attackers held more than 1,000 people and killed about 100; dozens more died when Russian troops unsuccessfully stormed the hospital June 17. Over 400 people were injured during the siege.