The allegation by Gupta, who is also the leader of opposition in the Delhi Legislative Assembly, comes in the wake of Delhi Water Minister Kapil Mishra's accusation that BJP was "shielding" senior Congress leader Dikshit in the scam.
Mishra had alleged that the Anti Corruption Branch's (ACB) visit to Shiela Dikshit's residence in connection with the scam was a "mere formality" and the agency was "under pressure" to "save" her.
A team of ACB officials visited her residence in Nizamuddin area here and gave the questionnaire.
ACB has said that action will be taken lawfully after receiving the response on the questionnaire.
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Gupta, in a statement, has demanded that ACB must probe and prosecute the offenders of water tanker scam immediately.
He alleged that the Aam Aadmi Party (AAP) was not leaving any stone unturned for dismissing the scam, which according to him is worth Rs 400 crore.
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