The Southeastern Pennsylvania Transportation Authority sued Bank of New York Mellon, seeking to recover what it called "unlawfully obtained" proceeds from foreign-exchange transactions. BNY Mellon manipulated FX transactions to maximize its profits at the expense of clients such as SEPTA, lawyers for the authority said in a complaint made public Wednesday in U.S. District Court in Philadelphia. The lawsuit follows two whistle-blower cases filed against BNY Mellon in Florida and Virginia. The bank's practices remained unknown until the complaints in those cases were unsealed, lawyers for SEPTA said. "The account statements provided to BNY Mellon's clients failed to provide pertinent details including time stamps for each FX transaction," SEPTA said in its complaint. "Without FX time stamps, clients were unable to verify that the FX rates charged by BNY Mellon were consistent with the actual FX rates and the time."