According to the San Diego Union-Tribune newspaper, the incident occurred on Saturday in Paradise Hill, a city located 35 km north of US-Mexico border, reports Xinhua news agency.
The police said they took the first 911 call at 6.49 a.m.and when they arrived on scene, they found several people from gunshot wounds.
A three-year-old boy, a 29-year-old woman and a 31-year-old man were found dead inside.
A five-year-old boy and nine-year-old boy were taken to a hospital but also died.
An 11-year-old boy was also hospitalized.
Matt Dobbs from San Diego Police Department said that a mother and four children lived in a granny flat adjacent to the main house, where other family members lived, but it was unclear how many people total lived in the compound.
Police found a gun in the house, but did not disclose its type, name of victims, or motive of the killer.
Disclaimer This article is published directly through a syndicated feed and not edited by The Indian Wire staff.