A third person is of interest to Police in relation to a violent Canning Vale incident earlier this month.
Homicide Squad Detectives need the public's help to identify another man they believe can assist them with their investigation into an assault in Canning Vale.
On the afternoon of Thursday December 7 around 2.30 a fight broke out between a group of people, some of whom were teenagers, out the front of a McDonalds restaurant in Canning Vale.
During the altercation several people were injured including a 16 year old boy who was stabbed and required medical treatment.
Inquiries are ongoing and detectives would like to speak to anyone who was in the restaurant at the time of the altercation.
This attack is related to the death of 16 year old Baldivis boy Jacob Cummins, who was run down by a car in a later incident.
It's understood the 20 year old Canning Vale woman responsible for Jacob's death was trying to get revenge for the earlier stabbing incident involving her younger brother.
A second person was taken into Police custody over the attacks earlier this month.
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