'Budgie Nine' remain in custody

Red Bull driver Daniel Ricciardo of Australia stands in his car as he celebrates after winning the Malaysian Formula One Grand Prix. Photo / AP

A decision is yet to be made over the fate of the nine Australians who have been detained in Malaysia for three days after they stripped down to budgie smugglers at the Grand Prix.

As the men's families flew into Malaysia to support their sons, Sepang assistant police commissioner Abdul Aziz Ali told AAP on Wednesday night that they were still "waiting for the decision" on whether or not prosecutors will charge the group.

Asst Comm Ali has previously said that he saw no problem with charges being laid - adding the group had bought the budgie smugglers in Australia to the race on Sunday with the clear intention of pulling the stunt.

They could be charged with an "intentional insult with intent to provoke a breach of the peace" or public indecency, he said.It is understood authorities are deciding whether to charge them, extend their detention period or release them on police bail.

It's the fourth night the group, which includes Jack Walker, an adviser to the Minister for Defence Industry Christopher Pyne, have been in custody.

When they were arrested on Sunday afternoon police alleged they were intoxicated and had revealed the swimsuits in a state of 'happiness' following Australian Daniel Ricciardo's win.

Ricciardo said he was unaware of the group's arrest until well after the fact and believes they will have learnt their lesson.

"I guess when they travel next time they will check the laws for where they go but, for me, there is no reason for anything else to happen," he told the Herald Sun.

"Obviously, Malaysia has their law and whatever will be, but from my side, personally, they were just enjoying the celebration and obviously it just went a step too far for those laws."

Foreign Minister Julie Bishop told the Nine Network she did not know if the group's actions would just be seen as a "lapse of judgement", saying it was clearly "premeditated".

It's not the first time foreigners have got into hot water in Malaysia for baring flesh.

In June last year, AFP reported that four tourists, including a British woman, were arrested after images of them undressing at the top of Mount Kinabalu on the island of Borneo went viral.

They were sentenced to three days in jail, fined 5000 Malaysian ringgit and deported.