HSH Nordbank AG said that Swiss bank UBS AG sold it $500 million in securities tied to U.S. subprime mortgages that have since soured, in the latest case of a midtier German lender to be singed by the slump in the U.S. mortgage market, the Wall Street Journal reported today. HSH, which specializes in shipping finance, joins a growing number of investors around the world, including municipalities in the United States and Australia, that fault the banks that packaged and sold the investments. HSH said yesterday that UBS had sold it investments tied to debt pools known as collateralized debt obligations and that those investments had incurred significant losses. HSH, based in Hamburg and Kiel, that it was considering legal action.