Lehman Brothers Holdings says Och-Ziff Capital Management, one of the world's biggest hedge funds, has information about efforts to "short and distort" the investment bank's stock before its collapse in September 2008.

According to a bankruptcy court filing, Lehman's lawyers said an investigation into the source of "false rumours" that helped bring down the investment bank indicate Och-Ziff "was involved with, or has information that pertains to short and distort' efforts" regarding Lehman securities.