Attorneys from Weil, Gotshal & Manges are urging a Manhattan federal judge to dismiss a multibillion-dollar securities class action, alleging in a new filing that plaintiffs' counsel in the case submitted false accounts from confidential witnesses to prop up claims against South African chemical firm Sasol Limited.

The allegations were made in a submission filed Monday in the U.S. District Court for the Southern District of New York. The motion followed a decision by U.S. District Judge Jed S. Rakoff in August denying Sasol's motion to dismiss the case, which alleged false and misleading statement by Sasol's top-level management regarding the construction of an ethane cracker plant in Lake Charles, Louisiana.