Swiss banking powerhouse UBS on Wednesday said that it does not have any accounts of stud farm owner Hasan Ali Khan,who is alleged to have stashed away money to the tune of billions of dollars in tax havens abroad. The documentation supposedly corroborating such allegations is false. UBS does not have accounts for,or any assets of Khan,and has no knowledge of any of the alleged transactions referred to in the recent media reports, the bank said in a statement issued here. On February 11,the Supreme Court had asked the Centre to ensure that Khan did not leave the country,in connection with the black money case. The bank also claimed that in January 2007,following a request for information from Indian authorities,UBS had informed Swiss justice department that the documents purporting to be from UBS,and suggesting that Khan was holding assets with it,were forged. Following investigation,the Swiss justice department and federal banking commission were satisfied that there was no basis for the allegations.