A 12-member Serious Fraud Investigation Office (SFIO) team on Saturday began grilling Satyam Computer's former chairman B Ramalinga Raju and two others in Chanchalguda jail here in connection with the Rs 7,800 crore fraud case.

The SFIO team arrived here at 10.40 am and went to the cell where Ramalinga Raju, his brother Rama Raju and former CFO Vadlamani Srinivas are lodged, jail sources said.