By Jonathan Rosenthal, Bloomberg HSBC Holdings Plc, Barclays Plc, and Lloyds TSB Group Plc are investigating claims that customer account details may have been sold by a former call center worker in India to an undercover reporter amid a probe by London police. City of London police contacted lenders yesterday about claims that data had been stolen and sold to the Sun newspaper, said police spokeswoman Orna Joseph, who declined to identify the banks.