The Trinamool Congress has hit out at the BJP over the call for a Nabanna Abhijan, a protest march announced by an unregistered body claiming to be a students' organisation to demand justice for the 31-year-old doctor killed in the chilling August 9 incident. The police say they have uncovered evidence of a conspiracy to create trouble and anarchy in West Bengal by misusing the anger of well-meaning citizens as the BJP says under pressure Mamata Banerjee has turned to her last line of defense-the police.