©WAtoday

A family has been found dead in an apparent murder-suicide in one of Perth’s most affluent suburbs.

A person, believed to be a care professional, arrived at the family home in Mosman Park just after 8am to attend a scheduled appointment, and phoned the police when they received no response.

Police at the scene in Mosman Park on Friday morning.© 9News Perth

Major crime division Detective Inspector Jessica Securo said the carer phoned police, and officers arrived at the house on Mott Close to find the bodies of a 50-year-old man, his 49-year-old partner and their two teenage boys.

Officers also discovered the bodies of two dogs and one cat.

“At this stage, there’s two parents and two children, so we would treat it as a double murder-suicide,” Securo said.

The boys were aged 14 and 16 years old.

Securo said a note was left, and while police would not disclose its contents at this stage, it was their strongest indication the deaths were the result of murder-suicide.

“We do know that both children experienced significant health challenges,” she said.

“This tragic incident occurred only this morning, and it will take time for police to investigate the full circumstances surrounding this incident.”

Police would also not disclose how the people died, but Securo said a weapon was not used, and it did not appear to be a “violent incident”.

Securo said WA police were attempting to narrow down the window of when the family were last seen alive.

This masthead understands the family involved has strong connections to one of Perth’s elite private schools, and their two teenage boys each experienced a developmental disability.

Five ambulance crews rushed to the house and stayed on the street for two hours while the coroner assessed the scene, with police warning members of the public to stay away from the area while they investigate.

Securo said the situation was “highly distressing” for all involved.

“The officers are understandably in shock after being confronted with such an incident like this,” she said.

“It’s not often that our officers come across such a tragic event with this many persons deceased.”

The Town of Mosman Park said in a statement a number of roads had been closed following the incident, and advised anyone with questions to contact police.

Darryn Boult said he lived down the street and had been walking his dog when he spotted multiple ambulance crews and police cars.

“There was probably about five police cars there so there was quite a bit of action that’s happened,” he told 9News Perth.

“There was quite a few sirens going off. They had two cars blocking the entry, and now it’s all taped off so they don’t want anyone going up there.”

Geoff Stewart also lives nearby and said he first noticed something was happening after going for a walk to the beach.

“I heard the police siren coming up behind me, ripping down McCabe Street, tore into the little side street there and within about 10 minutes there was [multiple] police cars marked and unmarked.

“About five minutes later an ambulance turned up.”

Stewart said it was usually a nice and quiet suburb.

Federal Curtin MP Kate Chaney, whose electorate covers Mosman Park, said in a statement the news was “shocking and devastating for our community”.

“My thoughts go out to the friends and relatives of this family, as well as the first responders, and the neighbours and local community who knew them,” she said.

“This heartbreaking loss of four lives will have lasting effects throughout our community.

“I hope the police investigation will provide more information soon about the circumstances that led to this tragic event.

“I encourage everyone impacted by this news to hug their loved ones and if needed.”

Multiple police crews and officers remain at the scene on Friday afternoon, with neighbours expressing their shock and devastation after hearing the news.