California authorities said a man fatally shot his wife, three of their children - leaving a fourth in surgery - and then himself, less than 24 hours after she'd obtained a restraining order against him.

The San Diego Police Department said the shooting occurred in Flintridge Drive in the Paradise Hills neighborhood of San Diego, California, Saturday morning, according to Fox 5.

Authorities said that the man - the woman's estranged husband - fatally shot her and three of their sons before turning the gun on himself. A fourth son, was seriously injured and rushed to hospital for surgery.

Family members identified the dead as José Valdivia, 31, and Sabrina Rosario, 29, along with their sons Enzie, 3; Zuriel, 5 and Zeth, 11, according to NBC7.

A fourth child, 9-year-old Ezekiel, is reportedly in a critical condition as of Saturday evening, after undergoing emergency surgery, the family members said.

Family members identified Sabrina Rosario, 29, as being killed in the shooting

Three-year-old Enzie Valdivia was killed at the scene of the shooting

Eleven-year-old Zeth Valdivia died in hospital, family members told NBC7

Police told Fox 5 they received a call at 6.49am Saturday, but nobody spoke to the dispatcher. Arguing could be heard in the background.

Police said that a second 911 call was made by a neighboring relative, who was calling to report the arguing and what apparently sounded like a nail gun being fired within the home.

When officers arrived, nobody answered the door.

Zuriel Valdivia, five, also died in hospital from his injuries, family members said

Ezekiel, 9, is in a critical condition in hospital, family members said

Officers then looked through the window and saw a child covered in blood, prompting them to break into the property.

Inside, they found the five people who had been shot.

Three-year-old Enzie, as well as his mother Sabrina and father José had died at the scene of the horrific shooting, while Zuriel, five, and Zeth, 11, died in hospital, NBC7 reported.

SDPD Lt. Matt Dobbs told reporters that the incident 'appears to be a tragic case of domestic violence, murder-suicide.'

Authorities are seen here at the home where police said a man fatally shot his wife and three of their four children, before turning the gun on himself Saturday morning in San Diego

One of the shooting victims is shown here being wheeled out of the home on a gurney

The shooting happened in Flintridge Drive in the Paradise Hills neighborhood of San Diego (pictured). Authorities are shown here cordoning off the area

Dobbs said that investigators believed that 'the male came over this morning, there was some kind of argument or disagreement and he used a hand gun and shot his family before turning the gun upon himself.'

Police said the shooting occurred less than 24 hours after the 29-year-old woman got a restraining order against her estranged husband, according to the New York Times.

Sabrina's sister, Jocelyn, told NBC7 that the parents were high school sweethearts, but she had filed for a divorce that had not been finalized.

She alleged that José had been stalking Sabrina, and had sent her photographs of a gun.

Police said during a press conference Saturday that officers had responded to the Flintridge Drive address earlier in November, where they found the estranged couple arguing over a set of tools.

Authorities are seen here Saturday at the home where an estranged husband was said to have killed his wife and three of his children, leaving a fourth in surgery

Police (seen Saturday) said that they had previously responded to the home and found the wife and estranged husband arguing over tools, but that the husband left when police arrived

The man was said to have been asking the woman for the tools, but left when police arrived. Police then said that they gave the woman information on how to file a restraining order.

Police said that the woman appeared to have secured her restraining order on Friday and that the man knew that she had done so before carrying out the murder-suicide.

It's unclear if the restraining order had been served against the man, however.

Police said that the man is the only suspect in the case and they are not looking for anyone else in connection with the shooting.

The home is just a block away from the elementary school.