The Justice Pathak Committee inquiring into the Iraqi Oil-for-Food scam has served notices on former External Affairs Minister K Natwar Singh and 17 others.
Natwar Singh has been asked to file an affidavit within ten days, according to officials.
Andleeb Sehgal, Natwar Singh's son Jagat, and former Ambassador to Croatia, Aniel Matharani are also among those who have been issued the notices, the officials said.
Natwar Singh, whose name appears on the Volcker report on the UN Oil-for-Food scam, had denied his involvement.
The Enforcement Directorate had quizzed Natwar Singh, Jagat and Sehgal on the issue.
The Enforcement Directorate has reportedly come in possession of some documents from Jordan and Iraq in connection with the suspected involvement of Indians in the scam.
Sehgal, the Director of Hamdan Exports, was also questioned by the Enforcement Directorate earlier.
Matharani, had also been questioned by the Enforcement Directorate.
Natwar Singh had to quit the Union Cabinet in the aftermath of the scam.