Five banks including Barclays, Deutsche Bank and HSBC have been accused in a US lawsuit of manipulating the London gold fix, an age-old pricing of gold twice daily. According to a Bloomberg report, Kevin Maher, a New York resident who said he bought and sold gold and gold futures and options alleges that the banks overseeing the gold benchmark - Societe Generale and Bank of Nova Scotia were also named - colluded to manipulate it.