Midland detectives are seeking information about a serious assault that occurred in Ellenbrook on Friday, November 4, 2016.
About 10.30am a 32-year-old man was assaulted at an address on Pine Grove Drive.
During the assault, the victim was stabbed in his arms and abdomen, which required medical treatment.
A 31-year-old man from Ballajura has already been charged.
However, a second man has not been identified.
The man is described as being dark-skinned and about 20 to 25 years old.