A Chechen terrorist who is Russia’s most wanted man has claimed responsibility for the Moscow metro bombings on Monday and promised to bring all out war to Russia’s streets. In a chilling video posted on an internet website considered to be a mouthpiece for Russia-based radical Islamists, Doku Umarov, a Chechen-born Islamist extremist, said he had ordered the attack on Moscow in revenge for an alleged massacre of civilians perpetrated by Russian special forces in February. The alleged massacre occurred on the border between the southern Russian republics of Chechnya and Ingushetia and saw up to twenty-two people killed.