Russia's Federal Security Service(FSB) Chief today said three members of a militant group involved in the March 29 Moscow metro blasts have been killed by Russian security force. <br/><br/>The head of the FSB, Alexander Bortnikov told Russian President Dmitry Medvedev in a meeting that all men behind the metro attack had now been identified and three of them were killed in a police ambush. <br/><br/>He said the three killed were members of a criminal group, which included people who had accompanied the suicide bombers on their way to Moscow and one of them to the site of the terrorist attack. Two explosions committed by suicide female bombers on March 29 killed 40 people.