Foreign states have described the blasts on Monday morning in Moscow's subway, which killed over 30 people, as "cowardly attacks" and expressed their condolences to victims in messages of compassion and support for Russia.

"We deplore these cowardly attacks in the most resolute manner," a statement by the German Foreign Ministry said. "Nothing can justify these vicious acts."

A similar message came from the French Foreign Ministry.

"France resolutely denounces these terrorist acts and assures Russia in its full support," it said.

Russian investigators said two women, who acted as suicide bombers, were responsible for the blasts at Lubyanka and Park Kultury stations in central Moscow. They said the explosive devices they used were equivalent to up to 2 kg of TNT.

"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)