Director General of Police (DGP) P K Thakur told reporters that a total of 11 separate FIRs have been lodged in the alleged scam.
Nine cases have been lodged for alleged embezzlement of funds of Rs 624.86 crore from various departments in Bhagalpur alone, one each FIR has been lodged for alleged embezzlement of funds of Rs 162.92 crore from land acquisition department in Saharsa and Rs 83.10 crore from land acquisition department in Banka district, Thakur said.
Four persons of NGO Srijan including its administrator and manager also figured among 18 persons arrested so far, Thakur added.
The government has also constituted STF to nab absconding Srijan's secretary Rajni Priya, her husband Amit Kumar and Rajiv Ranjan Singh, the then Land Acquisition Officer of Bhagalpur, the DGP said.
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State government officials had earlier on August 10 put the amount alegedly embezzled at over Rs 302 crore in the initial investigation.
Bhagalpur based NGO 'Srijan Mahila Vikas Sahyog Samiti' allegedly siphoned off hundreds of crores of rupees in connivance with bank officials and government officials and employees.
Apart from issuing instructions to seize passports of Rajni Priya and Amit Kumar, the CID, Bihar has also requested the Union Home ministry to issue "Look Out" notice against them on August 16, 2017, he said.
The issue (of embezzlement of public money) came to light on August 4 (2017) when of the cheques bounced, the police chief said.
Kumar said it was "eye opening" that a scam of this dimension did not come into notice till now.
He noted that a CBI probe has been recommended into the case and nobody would be spared.
"Unmindful of how mighty a person is, nobody would be spared in the inquiry into the scam and lawful punishment would be certainly given," he told reporters in his Vidhan Sabha chamber.
His both kidneys were damaged and he was surviving on dialysis, he said.
Leader of Opposition Tejaswi Prasad Yadav raised questions on the circumstances surrounding Mandal's death.
"He was killed by people in the government to bury truth of the scam," Tejaswi Yadav, flanked by his brother and former minister Tej Pratap Yadav, alleged outside the state assembly.
Tejaswi Yadav alleged that the NGO scam was "even bigger than Vyapam in Madhya Pradesh in which custodians of government money themselves facilitated loot of treasury".
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