Prime Minister Najib Razak's stepson Riza Aziz is contesting the US government's attempt to seize real estate properties allegedly bought with funds embezzled from 1MDB.

The Hollywood Reporter reported that in the filing last week, Riza claimed he is an "innocent owner" of the said assets.

In demanding a dismissal of the US Department of Justice's (DOJ) civil forfeiture suits, Riza's lawyer Matthew Schwartz said the US government had failed to include "essential details" about the supposed crimes.