Some attempts were allegedly made by a senior bureaucrat to stop the arrest of former Union Minister Mantang Sinh who was picked up by the CBI in connection with the multi-crore Shardha scam, agency sources claimed on Sunday. While CBI was officially mum on the alleged pressure, sources in the agency claimed that phone calls were being received from a senior bureaucrat to the top brass of the agency for preventing the arrest of Sinh, who was Minister of State in Home in P V Narasimha Rao's cabinet. Sinh was arrested on Saturday.