Law Minister Ashwani Kumar, who is under attack over vetting of CBI probe report on coal blocks allocation scam, on Thursday (May 9) went to the Prime Minister's Office, triggering speculation that he met Manmohan Singh but he denied it. Meanwhile, Attorney General G E Vahanvati met the Prime Minister and briefed him on yesterday's proceedings of the Supreme Court in the coal issue. Kumar was inside South Block, the office of the Prime Minister, for about 30 minutes.