17/10/2016 12:44 PM AEDT | Updated 17/10/2016 5:30 PM AEDT

Man, Woman And Two Children Found Dead Along With Dog

Police made the discovery inside a home in Sydney's north.

Fairfax media / Wolter Peeters
Police at a crime scene on Sir Thomas Mitchell Drive in Davidson where four people have been found dead.

A man, woman, two children and dog have been found dead after police were called to a home in Sydney's north.

Police made the devastating discovery at Sir Thomas Mitchell Drive in Davidson on Monday morning after responding to a 'concern for welfare' report.

Inside the house police found the bodies of a 43-year-old woman, a 44-year-old man and two children, a boy and girl aged 10 and 11 respectively. A dog was also found. Police have not yet confirmed their relation to each other.

Neighbours have told Fairfax media the family are originally from Colombia, and had lived at the house for about 10 years.

Police have yet to notify next of kin and say the adult pair were foreign nationals.

"The mother is held in very high regard in this community," Superintendant Dave Darcy told reporters on Monday.

"Since coming to Australia they have made a significant contribution to how we live. They've done a fantastic job"

He said both children suffered from a significant disability.

Asked if police were treating the deaths as a murder-suicide, Supt. Darcy said police wanted to keep their options open.

"I have specifically spoken with the homicide investigators and our investigators and we have come to a unanimous view that it is far too early to make such a conclusion," he told reporters on Monday.

"There is no one telling us at the moment what has happened.

"There is no one who has witnessed it."

Fairfax media / Wolter Peeters
Police are at the crime scene on Sir Thomas Mitchell Drive in Davidson.