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Blame, early now on a separatist group. that has really played havoc on the russian government for several years now. locally, here in new york the n.y.p.d. not taking any chances and we expect to see stopped up security across new yorks subway system, and also hearing word about this in washington, d.c., happening as russian prime minister vladimir putin makes a beeline back to moscow. >> reporter: dana lewis is live in the russian capital, any clarification on who was responsible for the attac...