A woman described as the internet girlfriend of a New Zealander being held in Bali for alleged drug-smuggling has also been arrested.
Antony de Malmanche was arrested last month, with police alleging he had been trying to bring nearly two kilograms of methamphetamine into Indonesia - an offence punishable by death
At the time of his arrest, Mr de Malmanche's family said he was the victim of an internet dating scam.
His lawyer, Craig Tuck, said the Indonesian police have been making many arrests and one of those detained is a woman he described as Mr de Malmanche's internet girlfriend.
Mr Tuck said the woman had been arrested in Jakarta and he had sent a lawyer to find out more.
He said he had been told by Indonesian police that Mr de Malmanche was carrying the least amount of methamphetamine of all those arrested.