Police are investigating a weekend incident in which a teenager received a gun shot wound to the head.
Major Crime Squad officers and Rockingham detectives are at a Hope Valley address.
The incident occurred about 8.30pm.
Police said the 18-year-old man was with friends at a residence when he received the head injury.
He is in a critical condition in hospital.
Police have confirmed that the man received a gun shot wound but the circumstances surrounding the incident are still unclear.