Prime Minister Manmohan Singh on Tuesday held discussions with his senior colleagues in the face of developments in the Satyam Computer Services case, which is billed as the the country's biggest corporate fraud. External Affairs Minister Pranab Mukherjee, Home Minister P Chidambaram, Commerce and Industry Minister Kamal Nath, Corporate Affairs Minster P C Gupta and Deputy Chairman of Planning Commission Montek Singh Ahluwalia attended the meeting.