Who are the usual suspects in the bombings?
Islamist extremists from the Northern Caucasus region of Russia are almost always suspected in bombings that happen in Russia.
The area they come from, located in the country’s mountainous south, includes Chechnya — home to an insurgent movement carrying out attacks locally and throughout Russia, such as: the hospital hostage crisis in Budyonnovsk in 1995, the siege of a Moscow theater in 2002, the bombing of a Moscow rock concert in 2003, the siege of a school in Beslan in 2004, several bombings in the Moscow metro, and the in-flight suicide bombings of two Russian aircraft in 2004.
http://edition.cnn.com/2011/WORLD/europe/01/24/russia.airport.explosion.backgrounder/index.html?hpt=C1
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