A day after being granted custody of YSR Congress chief Y S Jaganmohan Reddy by the Andhra Pradesh High Court, the CBI on Sunday began his custodial interrogation in the alleged disproportionate assets case registered against him.

The Kadapa MP, who was arrested by the agency on May 27 in the disproportionate assets case, is under judicial remand till June 11 and lodged at Chanchalguda jail. The AP High Court on Saturday had given Jagan's custody to the CBI for five days till June 7 and directed the agency to question him during the day hours and later send him back to Chanchalguda jail at night.

The CBI had sought the custody of Jagan saying it needed to confront Jagan over the facts emerging out of the investigation into the Vodarevu and Nizampatnam Port and Industrial Corridor (Vanpic) project.

The central investigating agency wanted Jagan's custody to also verify about the alleged investments of 850 crore rupees made in his businesses as part of quid-pro-quo transactions.

The CBI, which has so far filed three charge sheets in the case, has accused Jagan of getting investments of several crore rupees from firms into his own businesses as part of quid-pro-quo, when his father late Y S Rajseskhara Reddy was the chief minister of Andhra Pradesh.