Another set of allegations that an international benchmark interbank borrowing rate, based in Singapore, was manipulated by the biggest international firms stumbled on Aug. 18.

U.S. District Judge Alvin Hellerstein of the Southern District of New York denied large parts of the class suit FrontPoint Asian Event Driven Fund v. Citibank, 16-cv-05263, by two investment firms, while allowing for an amendment complaint to be filed to rectify some of the issues.

FrontPoint Asian Event Driven Fund and Sonterra Capital Master Fund allege that the defendants, which include Citibank, Royal Bank of Scotland, BNP Paribas and some 17 other banking institutions committed antitrust and RICO manipulation of the Singapore Interbank Offered Rate and the related Singapore Swap Offer Rate.