Islamist separatists of the Caucasus Emirate detonated two bombs on the Moscow Metro, killing 40 people and injuring 102 others.

The Caucasus Emirate, also known as the Caucasian Emirate, Emirate of Caucasus, or Islamic Emirate of the Caucasus, was a jihadist organisation active in rebel-held parts of Syria and previously in the North Caucasus region of Russia. Its intention was to expel the Russian presence from the North Caucasus and to establish an independent Islamic emirate in the region. The Caucasus Emirate also referred to the state that the group sought to establish. The creation of Caucasus Emirate was announced on 7 October 2007, by Chechen warlord Dokka Umarov, who became its first self-declared "emir".

The 2010 Moscow Metro bombings were suicide bombings carried out by two female Islamic terrorists during the morning rush hour of March 29, 2010, at two stations of the Moscow Metro, with roughly 40 minutes in between. At least 40 people were killed, and over 100 injured.

The Moscow Metro is a rapid transit system in the Moscow metropolitan area of Russia. It serves the capital city of Moscow and the neighbouring cities of Krasnogorsk, Reutov, Lyubertsy, and Kotelniki. Opened in 1935 with one 11-kilometre (6.8 mi) line and 13 stations, it was the first underground railway system in the Soviet Union.