The anti-money laundering agency has also issued a notice to his MP daughter Misa Bharti for producing certain documents.
Officials said the Enforcement Directorate recently filed a case against Prasad and his family members involving grant of licences to two Patna businessmen for running two hotels of the railways' PSU IRCTC in return for a prime plot of land in the Bihar capital when RJD supremo was railway minister in the UPA government.
Meanwhile, it also issued a notice to Bharti to furnish additional documents to the investigating officer (IO) of the agency who is probing her and her husband's role in a separate Rs 8,000 crore money laundering case in which they allegedly used shell companies to turn tainted money into white.
The ED had questioned Misa and husband Shailesh Kumar in this case early this month and now has widened the probe.
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In this case, too, the Enforcement Directorate will investigate the alleged "proceeds of crime" generated by the accused, purportedly through shell companies, officials said.
Prasad's wife Rabri Devi, also a former chief minister, son Tejashwi Yadav, a former deputy chief minister, and others will be probed by the agency under charges filed in the Enforcement Case Information Report (ECIR), the ED equivalent of a police FIR.
Others named in the CBI FIR include Vijay Kochhar, Vinay Kochhar (both directors of Sujata Hotels) who got the contract for running the two hotels, Delight Marketing company, now known as Lara Projects, and the then IRCTC managing director P K Goel.
Under the PMLA, the ED has powers to attach and confiscate tainted assets.
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