A five-member team of the ACB visited the DCW office around 3 PM and interrogated Maliwal for over two hours, said a senior ACB officer.
Maliwal was served a notice by the ACB on September 21 that she will be interrogated on September 29.
"Maliwal has submitted a written reply that runs into 20 pages to the questionnaire that she was given on September 19 by the ACB officers who had interrogated her. The questionnaire had 27 queries and Maliwal's answers will be analysed and further investigation will be carried out in the matter," he said.
After the questioning, Maliwal, in a series of tweets, said that she has "nothing to hide" and will "cooperate in investigation".
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"ACB questioned me on 27 points. Gave them all information. Have nothing to hide. Will cooperate in investigation. Not scared even of jail (sic)," she tweeted.
She wrote that she is not scared of going of jail.
"Even if I am sent to jail, I will continue my fight against the unjust system to seek empowerment of women," she tweeted.
The ACB had been probing the matter for the last two-three months and based on the questioning of Maliwal's employees, it was found that due procedure "was not followed in appointments," and an FIR under relevant section of Prevention of Corruption Act and sections 409 (criminal breach of trust) and 120B (punishment of criminal conspiracy) of the IPC was registered against the women's panel chief.
The ACB will also be questioning some Delhi government officials and the complainant will also be questioned again to seek clarity on some points, said the ACB officer.