Mandurah Detectives are investigating an aggravated armed robbery offence that occurred in Greenfields in the early hours of Wednesday morning.
Police say at about 3:30am, a man entered a residence on Forrest Way armed with a knife and had his face covered.
A brief struggle occurred between the man and the 80-year-old female occupant, who received a minor hand injury.
The offender fled on foot with the victim's mobile phone and some personal items.
Detectives believe the person involved in this incident is also linked six other burglaries (in company with another male) that have occurred in Greenfields and Dudley Park between October 7 and 9.
Detectives believe the two males pictured can assist with their inquiries.
Anyone with any information relating to this incident is urged to call Crime Stoppers on 1800 333 000 or report online at www.crimestopperswa.com.au. Callers may remain anonymous if they wish.