A Perth paediatrician facing child sex abuse allegations is back behind bars after having his bail revoked, as police laid another 15 charges relating to seven more alleged victims.

Dr Chia Liang Saw, 41, was initially arrested and charged in May, with police alleging he engaged in persistent sexual conduct with a child and possessed child exploitation material.

Saw’s request for bail was repeatedly delayed, with prosecutors adding further charges as more alleged victims were identified, before he was eventually released under strict conditions last month.

Now, the paediatrician faces a total of 72 charges relating to 18 alleged victims, with the new allegations revealed on Thursday including six counts of indecent dealing with a child under 13 years old, three counts of indecently recording a child under 13 years old, and three counts of sexual penetration of a child under 13 years old.

Saw’s bail was revoked when he fronted Perth Magistrates Court on Thursday after it emerged that he had breached the strict conditions around his use of electronic communications devices.

However, Saw’s lawyer told the court there was no “nefarious reason” behind the breach, and that the doctor had wanted to “get his affairs in order”.

Saw closed his eyes and shook his head when details of the new charges were read out, but nodded when asked if he understood them.

He did not apply for bail and was remanded in custody.

The court has previously been told Saw’s alleged offending took place between November 2022 and May this year in the Perth suburbs of Wembley, Nedlands and Midland.

Saw worked as a developmental paediatrician and operated from locations across Perth.

Police have previously alleged that some of Saw’s alleged victims were patients who had been covertly recorded while receiving treatment for ADHD.

During one of Saw’s bail applications last month, the court was told the paediatrician was arrested and charged after a “vigilante paedophile hunter” went to police with conversations they had with Saw while pretending to be a child.

In granting Saw bail last month, Magistrate Matthew Walton said the case was complex, and that it was highly likely there would be further charges.

However, Walton added that the fundamental thread of the Australian legal system was that a person was considered innocent until proven guilty.