“These new lawsuits target assets collected by corrupt officials and their associates through a massive scheme that stole billions of dollars from the people of Malaysia and laundered the proceeds across the world,” US Attorney Nick Hanna said in a statement.

The complaints filed on Friday in California involve luxury real estate in London and New York, as well as converted equity in a Kentucky facilities management company, and are tied to 2012 and 2013 bond offerings from the sovereign wealth fund, the department said.

Earlier this week, Malaysia’s Home Minister Muhyiddin Yassin said the country might postpone the extradition of former Goldman Sachs Group Inc banker Roger Ng, wanted in the multibillion-dollar scandal, so he could face criminal charges in Malaysia first.

The department has estimated that a total of US$4.5 billion was misappropriated by high-level 1MDB fund officials and their associates between 2009 and 2014, including some funds that Goldman Sachs helped raise as underwriter and arranger of three bond sales totalling US$6.5 billion.

Goldman has consistently denied wrongdoing and said certain members of the former Malaysian government and 1MDB lied to it about the bond sale proceeds.