The commission has also warned the two agencies of initiating civil court proceedings if the information sought by them is not provided.
"CBI and Delhi Police were summoned by the commission earlier for non provision of information in the alleged suicide case of BK Bansal and family. Inspector rank officers appeared on behalf of both organisations," a DCW official said.
"CBI requested the Commission to grant it exemption from appearance for it has sought clarification from the central government as to whether it can be summoned by the commission," a DCW official said.
DCW had earlier issued notices to CBI and Delhi Police, seeking action taken report in the case. But the commission was not satisfied with the responses received prompting, it to issue summons.
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"Police has given an evasive reply to DCW but has informed that it is in possession of two suicide notes - both from wife and daughter of Bansal. The panel has again summoned DCP East and sought copy of the suicide notes and reasons for non registration of FIR in the case besides other information," the official said.
Two months after their suicide, Bansal, former Director General Corporate Affairs, and his son Yogesh had also allegedly hanged themselves on September 27.
In their purported suicide note, Bansal had alleged that a CBI DIG, two women officers and a "fat" havaldar of the agency had tortured his wife and daughter to the extent that they ended their lives soon after his arrest on corruption charges in July.
"If CBI and Delhi Police will not provide complete information, the Commission will initiate civil court proceedings against them which will include issuing arrest warrants and attachment of salary of the officers summoned," he said.