Sources said the searches are being conducted by the Kolkata zonal headquarters of the agency in at least 15 places in Bhubaneshwar, Keonjhar, Rourkela (all in Odisha), Kolkata and Salem and Coimbatore in Tamil Nadu.
"Multiple teams of the agency assisted by local police are conducting the searches. The action is being carried out as part of an FIR registered under the Prevention of Money Laundering Act," they said.
They said the searches are also being carried out at the premises of an MLA rpt an MLA and a woman mine owner rpt a woman mine owner of Odisha against whom ED has slapped charges of money laundering.
The agency is also searching the premises of a Tamil Nadu-based mining operative who was running 'mafia' style iron-ore mining operations in Odisha, they said.
Officials said the operation has been codenamed 'Earth' and is expected to carry on till late into the day.
ED has registered a total of three FIRs to probe money laundering instances in illegal iron-ore mining scam in eastern Indian states, the most prominent one being the Uliburu mining case of Odisha.