NINE people were being questioned at the weekend in relation to the robbery in Samabula this week.
Police spokeswoman Ana Naisoro said the nine men allegedly robbed two businessmen in Samabula.
"The incident occurred on Thursday during a drinking party when cash and other electronic items were stolen from the home of two Russian nationals," Ms Naisoro said at the weekend.
She said the victims' vehicle was also stolen during the incident and was later found abandoned in Toorak.
She added that investigators had questioned the suspects on Saturday morning.
Ms Naisoro said some items had been recovered as investigations continued.
On Saturday night, she confirmed that three remained in police custody.