Russian President Dmitri Medvedev is calling for new laws to combat terrorism, as Moscow holds a day of mourning for 39 people killed Monday in twin suicide bombings on Moscow's metro.
In televised remarks, the president also called for new measures to increase safety in public transportation and other public places.
Mr. Medvedev spoke as grieving citizens piled flowers, lit candles and placed photographs of the dead near memorial plaques at two underground subway stations targeted in the attacks.
Video clip: A day of mourning in Moscow
Elsewhere in the capital, the Russian Orthodox church held a vigil at the Cathedral of Christ the Savior, and television stations canceled all entertainment programming. Authorities say Moscow's metro was operating at full capacity Tuesday.
There has been no claim of responsibility. But authorities say the bombings in central Moscow were carried out by two women with links to Islamist insurgents in Russia's restive southern republics.
Monday's bombings are the first in the Russian capital in six years.
Russian media say police were searching Tuesday for two women and a man seen with the female bombing suspects on surveillance video shortly before the attacks occurred.
Last month, Chechen rebel leader Doku Umarov vowed to take the battle for Chechyna's independence to Russia's cities.
Some information for this report was provided by AP, AFP and Reuters.