Four killed at California family gathering in 'targeted' shooting

People react near the scene of the shooting in Fresno, where a gunman opened fire on a family gathering

Four men have been killed and six injured in what police believe was a targeted shooting at a family gathering in California.

Police say about 40 people had gathered to watch football in the backyard of a home in Fresno on Sunday, when at least one gunman came in and opened fire.

"It's very likely that it was targeted, we just don't know why," Fresno police chief Michael Reid told reporters.

The attack occurred just days after a school shooting in southern California.

No suspects have been identified so far.

Police described the victims as Asian men between 25- and 30-years-old. Three were found dead at the scene. The fourth died in hospital.

Five others who were injured are recovering.

Dozens of people had gathered at a Fresno home when the shooting occurred late on Sunday

On Sunday night, police chief Reid told reporters: "Somebody picked that house and came up and shot several times."

"It looks like there was a target, we just don't know what the reasoning for the targeting was."

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The gunman - or gunmen - opened fire in the backyard when most of the women and children were inside the house, police said.

Officers are looking for surveillance video from the area to help identify suspects.

On Monday morning, just hours after the Fresno shooting, another gunman opened fire outside a Walmart store in Oklahoma, killing a man and a woman inside a car, before fatally shooting himself.

Police told US media that the victims knew the suspect - describing the shooting as an "isolated incident" - but did not provide further detail on the relationship.

A spokesperson for the Duncan Walmart, located about 80 miles (129km) south of Oklahoma City, said no staff members were involved.

Today's attack follows a school shooting in Santa Clarita, just north of Los Angeles on Friday.

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The 14 November attack on the Saugus High School by a 16-year-old gunman left two students, aged 16 and 14, dead, and three others injured.