Police are investigating three aggravated burglaries and an armed robbery at separate massage parlours, including one in Thomastown, from August to October.
It is believed an unknown man attended a massage parlour on Spring Street in Reservoir on Tuesday, August 27 about 11.30pm.
Police said the man entered the staff only area and stole mobile phones belonging to staff before fleeing the premises.
It is understood the same man attended another massage parlour on Tuscan Court in Thomastown about 2am on Wednesday, August 28.
Officers have been told the man engaged in services, which he then paid for with a mobile phone stolen from the incident on August 27.
The man left the premises and returned at 2pm when he entered the staff area and stole a purse belonging to a staff member.
Weeks later, the same unknown man attended the same massage parlour on Tuscan Court on Tuesday, September 17, about 6.30pm.
The man entered the staff area and stole a purse belonging to a staff member before leaving the premises, police said.
The following month, the unknown man re-attended a massage parlour on Tuscan Court on Saturday, October 19 about 2.45am.
It is understood the man approached a staff member and produced a knife, making demands for cash.
The man took an amount of cash and left the premises without physically injuring the staff member.
Investigators have released CCTV and images of a man who may be able to assist with their inquires.
