The information in his possession did not warrant any serious probe, the Bharatiya Janata Party leader told a press conference which turned out to be a damp squib.

On Monday, the Leader of Opposition in Rajya Sabha had promised to reveal to Prime Minister Manmohan Singh [Images] alone the name of the US mole in Narasimha Rao's PMO in the 90s, about which he had made a reference in his just released memoirs 'A Call to Honour.'

On Tuesday, Singh changed track and said he will not even seek time from the Prime Minister whom he accused of "talking through media." "If a particular civil servant served in a particular government in a high position to be privy to its nuclear programme and if he is alive, no longer in office or the country, I would be guilty of digging graves (by taking name)," he said.

However, outside the venue, he told TV reporters, "I do not know whether he was a civil servant but he was in the PMO."

Asked why he sat over the information on the 'mole' for a decade, the former External Affairs Minister said he felt no interest would be served by its disclosure and it would have appeared to be an act of "vendetta" at a time when the country was going through a period of uncertainty and repeated change of Governments.