THE distraught grandmother of two children found dead in an apparent murder-suicide involving their father has urged people suffering depression to get help.

Major Crime detectives are investigating the deaths of two children, aged just three and five, in Yanchep in Perth’s far north after their bodies were found on Thursday night.

Police were called to the property in Flight Vista about 10.30pm where they had to force their way in and found the children’s bodies.

A 35-year-old man, the father of the children, was found at the house with critical injuries and has been taken to Royal Perth Hospital, where he remains under police guard in a critical condition.

Police have not been able to speak to him yet, due to the severity of his injuries.

In Perth, the grandmother and mother of the children’s father said police had visited her at 4am on Friday with the devastating news.

“I thought I had a dream or something but when you face it and it is real ... it just hits you, especially with two little ones, grandchildren ... where do we go from here?” Georgina told ABC radio.

“If you are having problems, if you are feeling depressed, please God, talk to someone about it.”

Georgina paid tribute to her grandchildren, telling the ABC they “were gold, they were more than gold to me”.

Neighbours, as well as people from other parts of Perth, have paid their respects, placing flowers and toys on the front lawn of the property.

Police confirmed the boy, aged, 3, and the girl, 5, were found dead inside the house when they forced their way in late Thursday night, and the father was found with critical injuries.

It was initially reported the children had died from stab wounds, but police says that was not correct.

Acting Detective Inspector Peter Clements said police “were required to force entry” into the home at about 10.30pm.

“Once inside they located two deceased children,” he said.

“Their father was located also inside suffering from serious injuries.

“Major Crime Squad were called and we’ve now commenced an investigation into the circumstances around how this all unfolded.”

Camera Icon Police pull evidence from the Yanchep home. Credit: News Corp Australia, Justin Benson-Cooper Camera Icon Forensic police spent the day at the house piecing together the tragedy. Credit: News Corp Australia, Justin Benson-Cooper

The mother, believed to be a FIFO worker, was not present at the house last night.

Detective Clements said a Family Liaison Officer had been appointed and was in “direct contact’’ with the children’s mother, who is extremely distraught.

“She is obviously very, very distressed and we are doing what we can to provide support to her,’’ he said.

Detective Clements confirmed police were not looking for any other offender.

“There is no third party at this point in time,” he said.

Camera Icon Grim task: A Coronial officer removes one of the children’s bodies from the Yanchep house where two young children were killed. Credit: News Corp Australia, Justin Benson-Cooper Camera Icon Police detectives and forensics officers remain at the home, collecting evidence. Credit: News Corp Australia, Justin Benson-Cooper

NEIGHBOUR ‘HEARD SCREAMING SOUNDS’

Neighbour Bill Nyssen, who has lived in the area for nine weeks, said he heard screams about 6.15pm on Thursday night.

“I was in the dining room having dinner with my son and his partner when I heard a screaming sound,” he said.

“I thought it was the TV so didn’t pay much attention to it. I feel a bit guilty I didn’t do anything.”

Camera Icon Shocked neighbour Bill Nyssen, left, outside his Yanchep home. Credit: News Corp Australia, Justin Benson-Cooper

Mr Nyssen’s son, also named Bill, saw the children aged around four and five on Thursday morning.

“I didn’t know there were kids living there until my son saw them playing,” My Nyssen said.

“I’ve never seen the mother, apparently she’s FIFO. I did see the man two or three times and waved to him before.”

Local Debbie didn’t know the family but came to pay her respects with a bunch of flowers on Friday afternoon.

“As a mum you want to give them a hug,” she said.

Father-of-three Colin Nelson also stopped by to leave flowers.

“I feel remorse for the family and I’m a bit shattered, so is my wife,” the Jindalee estate resident said.

“We’ve been in Yanchep six years now and nothing like this has ever happened.”

About 8am Coronial officers removed the bodies of the two children from the house.

The crime took place in a newly built house in a new housing estate. Shocked and stunned neighbours said they had seen the children playing in the front yard of the house on Thursday afternoon.

It is understood the family had only moved into their new home a few weeks ago and neighbours thought the mother of the children may be a FIFO worker who is currently away.

Crime Scene Investigation teams and forensic officers are expected to remain at the property throughout the day searching for clues and collecting evidence.

Anyone with any information is asked to call Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au

– A gofundme page has been set up by the family: https://www.gofundme.com/zaraiyah-andreas-2vchwj64

Readers seeking support about suicide prevention can contact Lifeline on 13 11 14.

Suicide Call Back Service 1300 659 467.

MensLine Australia 1300 78 99 78.