The 26-page letter, released in Washington on the eve of the crucial NSG meeting in Vienna, created a furore in India and led to complications in deliberations of the 45-nation Nuclear Suppliers Group (NSG) which, however, subsequently granted the coveted waiver to New Delhi.

BJP and Left parties seized on the letter and accused the Government of hiding "facts" and demanded an urgent session of Parliament to discuss the issue.

In the controversial disclosures before the NSG meeting, the US had made it clear that it would stop fuel supplies and other nuclear cooperation if India conducted a nuclear test.

The US position in the letter appeared at variance with New Delhi's interpretation of some key clauses of the Indo-US nuclear deal.

The letter contained ‘certain’ issues which India will take up with the US, the sources said, adding New Delhi has made it clear where it stands.