The Central Bureau of Investigation (CBI) questioned B Ramalinga Raju, the founder of the erstwhile Satyam Computer Services and the prime accused in the biggest corporate scam in Indian history, for about three hours on Tuesday.
Raju was discharged from a Hyderabad hospital on Saturday, soon after the Supreme Court asked why his bail should not be cancelled.
The questioning of Raju would continue for the two or three days, CBI officials said. On Tuesday, the CBI sought clarifications about where he had parked the stolen funds.
The investigating agency has in the recent past sent 'letters rogatory' to six countries. While the UK, USA, Singapore and Malaysia sent part replies, Belgium and the British Virgin Islands are yet to respond.
Raju's questioning centred around funds which had "come and gone" in 1999-2000.
The CBI had issued notice on Monday summoning Raju to appear before it on Tuesday.