A Bloody history
Russia is looking at the explosion in St Petersburg's subway as a possible terror attack. If terrorists indeed are to blame, it would be the latest in a long line of attacks targeting the country in recent years
OCtoBer 2015: Militants from 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 DeCemBer 2013: Back-to-back suicide bombings in Volgograd kill 34 and injure 100 others
JAnuAry 2011: Suicide bomber blows himself up at Moscow's Domodedovo Airport, killing 35 and injuring 180 people MArCh 2010: Two suicide bombers attack the 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
OCtoBer 2005: Islamic militants launch a series of attacks on police in Nalchik, leaving 139 people dead, including 94 militants.
SeptemBer 2004: About 30 Chechen militants seize a school in Beslan town and take hundreds of hostages. 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.