The gunman at the centre of a Mandurah siege has been found dead inside a house after the property was stormed by heavily armed police.
Police had surrounded the house about 8am after a 75-year-old woman fled with gunshot injuries to the upper body.
The woman was carrying a firearm when she ran to a nearby house for help.
It is understood the woman managed to grab the firearm off her husband before fleeing their home, Inspector Wayne Hawes said the woman went to a nearby friend's home and was obviously distressed.
"What's occurred inside the house we are not exactly sure at this stage but it will be thoroughly examined and we will find out exactly what has occurred," he said.
A neighbour said he could hear police shouting, "we have the house surrounded, come out with your hands up" before TRG officers went into the home.
Police emerged from the house a short time later.
Paramedics then went into the house but the gunman, believed to be aged 67, was dead.
Insp Hawes said when TRG attended the home they discovered a firearm near the man's body.
TRG have left the house and internal investigators are at the scene.
It is unknown if the man, who reportedly had access to several firearms, died in the presence of police.
Boundary Road has been reopened but Churchill Avenue, Gillark Street and Dadger Street and Goomarl Street will remain closed for several hours.
The nearby Dudley Park Primary School, which is outside the cordoned off area, was locked down during the siege.
The injured woman is being assessed by medical staff at Peel Health Campus but her injuries are not believed to be life-threatening.
Forensic officers have left the hospital with several bags of evidence.
Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14.