The sources said the CBI also concluded that he would have been sole beneficiary in case books were purchased by the ministry. They said the forensic analysis of computers recovered from his office revealed similar forged letters written to various dignitaries.
Meanwhile, Nirmal is also alleged to be involved in another case probed by the CB-CID of Uttar Pradesh wherein signatures of Congress leader Motilal Vora and former chief minister Mayawati were forged on similar letter.
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