A former employee of the late billionaire Mohamed al-Fayed has said that she was “raped and brutally abused” while she worked at the luxury British department store Harrods, and that his brother was aware of her trafficking.

The account, detailed in an American court filing on Tuesday, said that Ali Fayed, Mr. al-Fayed’s younger brother, may have evidence showing that Harrods was complicit in the widespread sexual abuse of company employees by its owner Mr. al-Fayed, and in its coverup.