"I think, people who are affected by them (Wikileaks expose), they have already commented on them, casting serious doubts about the veracity of allegations made in these diplomatic despatches," Singh said here while commenting on the Wikileaks expose which alleged that MPs were purchased during the 2008 trust vote.

"I have no knowledge of any such purchases and I am absolutely categorical, I have not authorised anyone to purchase any votes. I am not aware of any acts of purchase of votes," he said while replying to questions at the India Today Summit.

"I am absolutely certain in asserting that I am not at all, I think, involved in any of these transactions," the Prime Minister insisted.

His response, however, did not categorically clarify whether or not the purchases took place at all during the Confidence Motion on July 22, 2008.

"As far as the events of the last few days (are concerned) and the so-called Wikileaks, I would not like to comment," Singh said about the Opposition onslaught on the government following the Wikileaks expose.

"I would not like to comment on what we are going to do right now or in days to come. These are the matters which are being discussed in Parliament. If I have anything to say, we would say in Parliament first," he said.