Russia's secret service FSB on Monday confirmed that the two bomb explosions at two stations of Moscow's Metro line were carried out by suicide attackers, DPA reported.
It was noted that one of the attack sites, the Lubyanka station, is close to the Federal Security Service headquarters.
The attacks, the worst in the country in six years, killed at least 35 persons and wounded about 40 others, according to latest accounts. In 2004, a suicide attack on the Metro killed 40 persons.