A timeline of the deadliest attacks in the troubled region since 2002.
2002

— May 9, Dagestan 43 people die in the town of Kaspiysk when a bomb explodes in the midst of a military parade commemorating Russia's victory in World War II.

— August 19, Chechnya 121 people die when a giant Russian Mi-26 helicopter carrying both troops and civilians is shot down near Grozny by separatists.

— December 27, Chechnya 83 die in an attack carried out by three suicide bombers in front of the headquarters of the pro-Russian Chechen administration in Grozny.
2003

— May 12, Chechnya 60 are killed when suicide bombers drive a truck packed with explosives into a government building in the northern village of Znamenskoye. The attack is claimed by leading Chechen rebel commander Shamil Basayev.

— Aug 1, North Ossetia Fifty people are killed in a truck bomb attack on a military hospital in Mozdok, claimed by Basayev.
2004

Sept 1-3, Chechen separatists operating in the republic of North Ossetia take some 1,200 children, teachers and parents hostage at a school in the town of Beslan.

The siege ends in a shootout with troops that kills at least 375 people, over half of them children.
2008

— Nov 6, North Ossetia Eleven die in a suicide attack on a minibus at Vladikavkaz.
2009

— July 4, Ingushetia Militants ambush a Chechen police convoy, killing 10 officers.

— Aug 13, Dagestan Eleven people, including four police officers, are killed in an attack on a police checkpoint.

— Aug 17, Ingushetia A truck packed with explosives rams through the gates of the police headquarters in Ingushetia's main city, Nazran, killing 24 and injuring more than 100.
2010

— March 30, Dagestan At least 12 people, including two bombers, die in double attacks in the Dagestan town of Kizlyar.

— Sept 9, North Ossetia At least 16 people killed in a suicide bombing in a crowded market in Vladikavkaz.—AFP