The terrorists behind the two blasts that...
destructive nature of the blast.A day of mourning has been announced for Tuesday in Moscow.
Russia has been fighting militants in the North Caucasus for almost two decades, including two brutal separatist wars in Chechnya. Analysts suggest Monday"s attacks are revenge for a recent operation in Chechnya that saw the deaths of over 20 radical Islamic fighters.
Aside from Chechnya, militant violence is also a regular occurrence in the neighboring republics of Ingushetia and Dagestan.
The last major terrorist incident to hit Moscow occurred in the autumn of 2004, when ten people were killed in a suicide bombing outside a metro station.
The explosion was part of a series of terrorist attacks that also saw 90 people die in two plane bombings and the deaths of over 300 people, many of them children, when Chechen terrorists seized a school in the North Ossetian town of Beslan. A bomb in the Moscow metro in February 2004 also killed 40 people.