The agency is also understood to be mulling to take "legal action" in case Mallya does not present himself or produce valid reasons for absenting before agency investigators as scheduled on March 18 in Mumbai.
Official sources said the agency has written to the 17 banks who lent money to the grounded Kingfisher Airlines and later went to the Debt Recovery Tribunal(DRT) for recovery of these dues.
"The exercise of contacting all the stakeholders concerned in this case is with an aim to obtain more information. The agency's probe is under criminal provisions of the Prevention of Money Laundering Act and there has to be a proper corroboration of facts and solid evidence," they said.
They said the agency is also looking for details of overseas and domestic assets of Mallya and his company officials, in coordination with central security agencies and the CBI.
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Sources said as the post of regional chief of the agency
is vacant at present in Mumbai, ED Director Karnal Singh will be personally monitoring the overall investigation in the case.
The agency haD ealier issued summons to over half a dozen officials of the IDBI bank and Mallya-owned Kingfisher Airlines under PMLA in the case.
The ED recently registered a money laundering case against Mallya and others based on a CBI FIR registered last year. The agency is also investigating the overall financial structure of Kingfisher Airlines and will look into any payment of kickbacks.
The ED is looking into the "proceeds of crime" that would have been generated using the slush funds of the alleged loan fraud and it is also probing if some of this amount was sent abroad illegally, they said.