 This incident is on top of the illegal detention of Cornelia Rau, an Australian citizen who was accidentally imprisoned in a detention centre when the immigration department suspected her of being an illegal immigrant.
<meaning-changed>  This incident is on top of the illegal detention of Cornelia Rau, an Australian citizen who was accidentally imprisoned in a detention centre when the immigration department suspected her of being an illegal immigrant.
 This incident is one of a number of immigration controversies that have occurred in Australia. Cornelia Rau, an Australian citizen who was accidentally imprisoned in a detention centre when the immigration department suspected her of being an illegal immigrant.