U.S. President Barack Obama condemned Monday"s...

Russian investigators said two female suicide bombers were responsible for the blasts. They said the explosive devices used were equivalent to 4 kg of TNT at the Lubyanka station and 1.5-2 kg of TNT at the Park Kultury station.

"People in our country share the pain of the heavy and unrecoverable loss," Ukrainian President Viktor Yanukovych said in his message to his Russian counterpart Dmitry Medvedev.

"I am deeply shocked by the bloody terrorist act against peaceful people," a message from Lithuanian Prime Minister Andrius Kubilius said.

MOSCOW, March 29 (RIA Novosti)