A Timeline of Major Attacks in Russia in Recent Years

The damaged train carriage at Technological Institute metro station in Saint Petersburg on April 3.

Photographer: AFP via Getty Images

Moscow (AP) -- If the explosion on a subway train in St. Petersburg turns out to have been a terrorist attack, it would be the latest in a long line of attacks targeting Russia in recent years. Some of the deadliest include the following:

— October 2015: Militants from local affiliate of Islamic State down a Russian airliner en route from Sharm el-Sheikh to St. Petersburg over Egypt, killing all 224 people on board.

— October 2014: Suicide bomber wearing a police uniform blows himself up in Grozny, the capital of Chechnya, killing five policemen and wounding 12 others.

— December 2013: Back-to-back suicide bombings in the southern Russian city of Volgograd kill 34 and injure 100 others.

MOSCOW, RUSSIA - JANUARY 24:  Ambulances wait outside Domodedovo airport after a suspected suicide bomb attack on January 24, 2011 in Domodedovo, Russia. The explosion inside the terminal building of Russia's busiest airport has reportedly killed at least 35 people and injured over 100. (Photo by Epsilon/Getty Images)

Ambulances wait outside Domodedovo airport in Jan. 2011.

Photographer: Epsilon/Getty Images

— January 2011: Suicide bomber blows himself up at Domodedovo Airport, Moscow's busiest, killing 35 and injuring 180 people.

— March 2010: Two suicide bombers attack Moscow subway system, setting off their explosives about 30 minutes apart on two trains during rush hour, killing at least 40 and injuring more than 100.

— November 2009: A bomb explodes under the high-speed Nevsky Express train travelling between Moscow and St. Petersburg, causing a derailment that kills 28 and injures nearly 100. A previous attempt on the rail line in 2007 caused more than two dozen injuries but no deaths.

NALCHIK, RUSSIAN FEDERATION:  A member of Russian special armed forces storms a shop, as his colleague lies wounded next to him in the southern city of Nalchik, 14 October 2005, where gunmen were holed-out following a deadly rampage the previous day. Russian security forces Friday stormed a police station and a shop where gunmen were holed up following a deadly rampage in the southern city of Nalchik, killing 10 rebels and freeing at least five hostages, officials said.  AFP PHOTO / MAXIM MARMUR  (Photo credit should read MAXIM MARMUR/AFP/Getty Images)
Russian special armed forces storms a shop in Nalchik in Oct. 2005.
Photographer: Maxim Marmur/AFP via Getty Images

— October 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.

— September 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.

— August 2004: A suicide bomber blows herself up outside a Moscow subway station, killing 10 people.

— August 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.

Rescue workers hold stretchers near the Avtozavodskaya metro station in Moscow in Feb. 2004.
Photographer: AFP via Getty Images

— February 2004: A suicide bomber strikes a subway car in Moscow during rush hour, killing 41 people and injuring more than 100.

— December 2003: A suicide bombing on commuter train in southern Russia kills 44 people, two days before Russian parliamentary elections.

— October, 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.

MOSCOW, RUSSIAN FEDERATION:  (FILES) -- A file photo taken 26 October 2002 in Moscow shows Special forces soldiers carrying out hostages during the storming of the theater building captured by Chechen gunmen leaving 117 hostages and 50 Chechen militants dead, almost all of them gassed by Russian forces in a controversial army assault. More than 100 people were reportedly killed and hundreds wounded 03 September 2004 as Russian special forces stormed a school to free scores of children and adults held hostage for almost three days by militants demanding independence for Chechnya.    AFP PHOTO ITAR-TASS/JAPAN OUT    (Photo credit should read ANTON DENISOV/AFP/Getty Images)

Special forces soldiers carry out hostages during the storming of the theater building captured by Chechen gunmen in Oct. 2002.

Photographer: AFP via Getty Images

— 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 the following month.

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