Mandurah Detectives are investigating after a series of gunshots were fired in Dudley Park, Coodanup and Meadow Springs overnight.
WA Police confirmed the incidents occurred between 7.15pm 10.30pm on Monday, April 13.
Investigators, with the assistance of officers from Regional Operations Group and forensic specialists, believe the incidents are linked.
In Dudley Park, several shots were fired into a telephone box on Waterside Drive.
Further, in Coodanup, a group of three or four people driving a sedan, forced entry into a house on Steerforth Street.
The offenders threatened the occupants of the house, demanding money and/or drugs before assaulting a man in his 40s.
The man received critical injuries and was conveyed to Royal Perth Hospital. At this time, he is expected to make a full recovery.
It is believed the offenders discharged a firearm before leaving.
Further, in Meadow Springs, a group of three-four people driving a sedan forced entry into a house on Killarny Street.
The offenders threatened the occupants of the house, demanding money and/or drugs before assaulting a man in his 30s.
The man received serious injuries and was conveyed Peel Health Campus. At this time, he is expected to make a full recovery.
It is believed the offenders discharged a firearm before leaving.
Detectives are asking anyone who lives in the areas to check their CCTV for any suspicious activity. They are also asking anyone who was driving along the roads mentioned above between 7.45pm and 10.30pm, who has dash-cam footage to come forward.
Anyone with information relating to this incident is urged to call Crime Stoppers on 1800 333 000 or report online at www.crimestopperswa.com.au.