U.S. authorities are investigating major banks over potential manipulation of the precious metals market, the latest development in a series of probes related to major financial benchmarks. HSBC is among at least 10 major banks being investigated by U.S. authorities for possible rigging of the price-setting process for gold, silver, platinum and palladium, The Wall Street Journal reported late Monday. The report said other banks being scrutinized include: Goldman Sachs; JPMorgan Chase; Britain-based Barclays; Swiss banking giants UBS and Credit Suisse; Bank of Nova Scotia; Germany-based Deutsche Bank; France-based Socit Gnrale; and South Africa-based Standard Bank Group. U.S. authorities declined to comment. Goldman Sachs, HSBC, Deutsche Bank and Barclays, HSBC, UBS and Bank of Nova Scotia have been named as defendants in various putative class-action lawsuits in U.S. federal courts over suspected manipulation of precious metals pricing. The complaints contend that bank traders conspired to manipulate the price of metal derivatives in a bid to reap profits on proprietary trades. The new U.S. investigations follow separate bank probes launched earlier over suspected manipulation of the $5.3-billion-a-day foreign exchange currency trading market, along with rigging of the London Interbank Offered Rate (Libor), which is used to set rates on billions of dollars in loans, credit cards and mortgages.