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The Central Bureau of Investigation (CBI) has registered a fresh case against former Arunachal Pradesh chief minister Nabam Tuki on charges of his involvement in a graft case.

The premier investigating agency filed an FIR for his alleged involvement in anomalies related to a contract for construction of a Kendriya Vidyalaya boundary wall in Salt Lake area in Kolkata.

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According to CBI the officials of the Public Works Department, Arunachal Pradesh, awarded the tender to firms managed by the family members of Tuki, who was the then PWD Minister, flouting the stipulated procedures.

57-yeae-old Congress leader Tuki  was the chief minister of Arunachal Pradesh from 2011 to 2016.

The FIR has been filed on the findings of a preliminary probe that was conducted following the directions of the Guahati High Court.

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Several work orders were awarded in 2005-06 by the PWD to the agencies owned by the relatives of Tuki at his behest.

Officials said that the then assistant commissioner of the Kendriya Vidyalaya Regional Office had moved a proposal for the construction of a permanent building inside the Salt Lake premises and entrusted the work to the Arunachal Pradesh PWD despite the fact that it did not have the ability.