Comptroller and Auditor General Vinod Rai today briefed the Public Accounts Committee about his report in the 2G spectrum allocation.

His report on a presumptive loss of Rs 1.76 lakh crore in 2G spectrum allocation had created a storm in Parliament and outside.

The PAC, headed by BJP veteran Murli Manohar Joshi, is examining the controversial allocation of 2G radio waves and Rai apprised the committee of how the audit looked into the whole issue.

Meanwhile, Prime Minister Manmohan Singh today wrote to PAC expressing his willingness to appear before the panel which is going into the 2G spectrum allocation scam.

The CAG report has proved to be quite an ammunition for the Opposition, including the BJP and Left parties, to target the government and it is insisting that only a Joint Parliamentary Committee can bring out the truth in what they allege is the "biggest scam in independent India".

The demand for JPC has led to stalemate in Parliament with the government stoutly resisting Opposition's demand.

A decision to ask Rai to appear before the powerful parliamentary committee was taken during its last meeting earlier this month. The Committee has already invited views and suggestions on the 2G spectrum allocation.