According to ACB IG V K Singh, Soni used to collect bribe amount in the form of consultancy fees from firms in lieu of getting them tenders from the department in collaboration with the officers.
Soni used to collect bribe amount and distribute among the officers, who included former Additional Mission Director, NRHM Neeraj K Pawan, Additional Director IEC Anil Kumar Agrawal, Chief Accounts Officer Deepa Gupta and Store keeper Joji Varghese, he alleged.
An FIR was registered yesterday by the complainant, following which raids were conducted at 18 premises belonging to all the four today.
"The complainant gave Rs 1.5 crore as the bribe amount to Soni in the last few months to get work orders worth Rs 7 crore. During search operation, we recovered a car, a scooty from the IAS officer's home which were purchased by the Soni for the officer," he said.
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"We will inform the Enforcement Directorate about the recovery of dollars," he added.
As for other officers, they all are under surveillance but no one has been arrested so far, Singh said.
"We are presently working on the specific complaint and the scope of investigation will be broadened in coming days," he added.
The officer claimed that the ACB sleuths have recovered several important documents, files, electronic devices which have "crucial details about the bribes".
Pawan, an IAS officer of 2003-batch, is presently posted as the Commissioner in the agriculture department.