Two adults and two children have been found dead in the Perth suburb of Mosman Park in a suspected murder-suicide, police say.

At 8.15am on Friday, emergency services received a distressed call from a person known to the family who had gone to the home on Mott Close, in the city’s southwest.

Police arrived on the scene shortly after to find the bodies of two adults, a man aged 50 and a woman aged 49, and two children aged 14 and 16. Three deceased pets were also found.

“It is believed these persons are known to each other and are part of the family unit,” Det Insp Jessica Securo said in Friday.

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Securo said it didn’t appear to be “violent incident”, saying no weapon appeared to have been used.

“The family have no reported family violence matters with police,” Securo said.

Securo added that both children had “significant health challenges” and had engaged with care services in the past.

A note was left at the premises – cited as the main reason police were treating the incident as a murder-suicide.

A spokesperson for St John Ambulance WA said it send five crews to the house this morning just before 8.30am on priority 1 conditions, which reflect potentially life-threatening calls.

Securo described it as a “confronting” and “highly distressing” scene.

“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.

“That’s why we employ a health and welfare and our police chaplain to attend the scene as soon as possible, speak to the officers, wrap our arms around them and make sure they are OK.”

Police remain at the home, located in a cul-de-sac in one of Perth’s most affluent suburbs, with several surrounding streets cordoned off.

In Australia, the national family violence counselling service is on 1800 737 732. The crisis support service Lifeline is 13 11 14.