Ibobi Singh of the Congress was the chief minister of Manipur from 2002 to March 2017.
The FIR was yesterday lodged at the Imphal police station against Ibobi Singh and former chief secretaries Y Ningthem Singh, P C Lawmkunga and O Nabakishore Singh. Also named in the FIR were former project director of MDS D S Poonia and its administrative officer Ranjit Singh, the officer said.
The vigilance report said the former Chief Minister "is required to be examined and record his statement as he was the chairman of MDS from July 1, 2013 to August 31, 2014".
In November last year, the Planning Department of the state government had approached the Vigilance department to conduct an enquiry into the alleged financial irregularities in MDS.
Meanwhile the Manipur Pradesh Congress Committee spokesperson A K Ranjit said only after the conclusion of the investigation on graft charges, their authenticity should be determined.
The Congress "welcomes the investigation process," he added.
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