Prime Minister Vladimir Putin said the "terrorists" responsible for the Moscow subway attacks Monday "will be destroyed."
"We are providing Moscow metro with additional CCTV cameras. Today's events show we should not only continue this work but to make it more effective. Changes in legislation may be necessary."
The two explosions that rocked the subway stations in central Moscow during rush hour killed at least 38 people and wounded more than 60 others, spawning widespread public outrage.
"It's disgusting," one witness said. "I don't know who did it and what they wanted. Life is so short. How could people commit such terrible acts?"
Although they have yet to claim responsibility, Bortnikov's statement is a strong implication that Chechen rebels fighting for independence were behind the strike.
Thousands have been killed and 500,000 Chechens displaced in the Chechen rebels' almost 20-year conflict with Moscow. The area is in the North Caucasus region of Russian between the Black and Caspian seas.
The first blast occurred at 7:56 a.m. at Lubyanka subway station, the Ministry of Emergency Situations reported on its Web site. The Lubyanka station is near the Kremlin and Federal Security Service headquarters. The Federal Security Service is Russia's intelligence agency.
Another blast happened about 40 minutes later at Park Kultury station, on the same train line. Three Moscow hospitals were treating the wounded, the ministry said.
Yulia Shapovalova of Russia Today TV was at the second station at the time of the blast.
"The staff members started urgently evacuating people, so that meant they probably knew about the first blast at the Lubyanka station," she said. "All the people -- a huge crowd of people -- slowly started to move. ... As soon as I got upstairs, I heard the blast."
