Kejriwal's private secretary Bibhav Kumar too was questioned last week by the ACB in the case. 
The Arvind Kejriwal-led AAP government had in June 2015 constituted a fact-finding committee to look into the alleged irregularities in procuring 385 stainless steel water tankers by the Delhi Jal Board.
In June 2016, the government had sent the report of the fact-finding committee to then Lt Governor Najeeb Jung, following which an FIR was registered in the case.
The report had stated that tender conditions had been violated. The committee had also found that the tender of a company was rejected and another firm was awarded the same on higher rates.