MOSCOW, January 17 (RIA Novosti) - Russia's...

Russia's defense minister, Sergei Ivanov, told journalists that his ministry has reinforced security around especially important military and state facilities.

Reports are coming in from all over Russia that security measures have been reinforced on public transport to prevent a possible attack.

Two bomb explosions in Moscow's metro system in 2004 killed a total 49 people and injured more than 300.

A bomb detonated in a train carriage between the central metro stations Avtozavodskaya and Paveletskaya in February, and in August another went off near the entrance to Rizhskaya station in northern Moscow.