Vadra is expected to be questioned again on either Friday or Saturday.
The Congress on Monday stepped up its attack on the BJP-led Centre over the issue of price rise with Rahul Gandhi saying the biggest problems facing the country were unemployment, inflation and growing hatred.
Vadra, on Facebook termed as "witch hunt" the Enforcement Directorate's action of attaching assets of a firm linked to him, and claimed that it showed "complete misuse of assertion of power".
The leaders alleged that those who had no contribution in the freedom struggle wanted to spread fear 'in the name of nationalism', suppress the voice of people and were questioning the legacy of Congress.
The agency has registered a case against Roy, his wife Radhika and RRPR Holdings for allegedly causing losses of Rs 48 crore to ICICI Bank, CBI sources said.
Troubles for the beleaguered Chief Minister of Rajasthan Vasundhara Raje mounted on Friday with the disclosure that she was the beneficiary of investments of over Rs 11 crore made by tainted IPL ex-commissioner Lalit Modi in her son's company at a high premium.