The probe agency has based its Prevention of Money Laundering Act (PMLA) FIRs on two complaints filed by CBI against Singh in August this year.
"Two cases have been registered under PMLA against Singh for amassing wealth through alleged illegal means," sources said.
ED had also been asked by the Special Investigation Team (SIT) on black money to file a criminal case against Singh last December but the absence of a 'predicate' offence or a basic criminal case report against the officer was a legal obstacle being faced by it to go ahead in this regard.
CBI, after an Allahabad High Court order, registered two cases against Singh and his family members for alleged corruption and amassing assets disproportionate to known sources of income.
Close on the heels of lodging these two cases with a special CBI court, the agency had in August carried out searches at various locations including at Yadav's residence and offices of Noida. CBI today again conducted some searches in this case.
ED, sources said, had also got in touch with the Income Tax department to obtain more information about financial details on Singh as the tax sleuths were the first to have taken action against him as they conducted searches on his premises in Uttar Pradesh last year.
"Besides, an amount of Rs 10 crore (approx) was allegedly recovered from one of his associates which also reportedly belonged to then Chief Engineer," CBI had said.
