Update, 1pm: Police have called for the public's help in identifying a man's body found in Swanbourne after a suspected shooting murder.
Police were called to a park in North Street about 11.30pm after a local resident found a man’s body with severe head injuries.
Police are treating the death as a suspected homicide
The man was described as about 180cm tall, Caucasian, with brown eyes and thick dark hair past his neck. The hair at the back of his head was dyed a lighter colour than the hair on top of his head.
The man also had a goatee under his chin, a dark-coloured moustache and an unshaven appearance, with patchy hair around his neck.
A particularly distinguishing feature was a two or three-centimetre wide scar that ran from just above his wrist up under his sleeve.
Witnesses told police they heard what they believed to be a gunshot in the area shortly before the body was found.
A woman whose home is next to the park is believed to have discovered the man's body.
She went outside to investigate after hearing the shot and found the man lying dead on the ground close to her side wall.
Detectives believe the unidentified man, who is believed to be in his thirties, died as a result of a gunshot to the head.
Heavily armed tactical response group officers were among the first at the scene, fearing the gunman might still be in the area. They did a sweep of the surrounding streets, guided by the police helicopter, to hunt the shooter and ensure the area was safe before other officers moved in.
Marmion Street resident Peter Barnes said he and his wife heard what sounded like a gunshot about 11.30pm.
"We thought it might have been something from the Swanbourne barracks," he said. "It certainly sounded like a shot."
His wife also heard a helicopter overhead and went to make sure their doors and windows were locked.
"We didn't hear anything after that," Mr Barnes said. "All I heard was a bang."
Mr Barnes said he had not thought too much about the noise and had been a bit surprised to come out this morning and see the police tape.
Another Marmion Street resident said he had heard a car screech down the street about the same time.Two residents in Clements Street told police they heard motorbikes roaring up and down their street
about 11.30pm and a car that seemed to be squealing its tyres.
The woman, who did not want to be named, said she did not hear a gunshot but heard the police helicopter and sirens.
Streets surrounding the park have been cordoned off as forensic officers examine the scene.
Detective Sergeant Graeme Johnston from the Major Crime Squad said police were yet to find a murder weapon.
Police officers have also been searching nearby Allen Park for evidence.
He said officers were canvassing residents to see if anyone heard or witnessed anything suspicious last night and hoped some residents had CCTV cameras setup around their homes.Anyone with information is urged to call Crime Stoppers on 1800 333 000.
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