Police on Sunday night conducted raids at different places in Jharkhand after it was found that many of the accused in Patna serial bomb blasts hail from the state and black powder was recovered during raids.br br A political blame game over the Patna serial blasts erupted on Sunday with the BJP, whose rally by Narendra Modi was targeted, alleging the security at the venue was inadequate and Chief Minister Nitish Kumar ruling out any lapse on this score.