The other six shot were taken to a local hospital and treated for non-life-threatening wounds.
All the victims were Asian men ranging from ages 25 to 35.
"What we found [when arriving on the scene] were several individuals deceased in the backyard", Dooley said.
Attackers sneaked into a private house and opened fire on the owners and their guests, who watched a football match in the backyard.
Fresno Police spokesman Lt. Mark Hudson did not immediately return email and phone messages Monday seeking comment.
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The victims were taken to Community Regional Medical Center in critical condition with some now critical but stable, the TV stations reported.
"The initial information is that somebody came up on foot, possibly, at least one suspect did, and began firing", Reid said.
There is now no suspect information.
Agents with the federal Bureau of Alcohol, Tobacco, Firearms and Explosives are also on scene.
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Fresno police say the shooting took place about 6 p.m. Sunday on the city's southeastern side.
"This an emergency now in this neighborhood and we are doing all we can to cause things down", he said.
This is a developing story, check back later for details.
A San Diego father is suspected of fatally shooting his wife and three sons - gravely wounding a fourth - before turning the gun on himself Saturday, The Sacramento Bee reported. In another part of the city, a man in his 20s was fatally shot inside a home.
Fresno Police Chief Andrew Hall said numerous victims may have taken part in an altercation in the days prior to the shooting.
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Ten people were shot in Sunday's shooting. He died the next day. They worked to interview 35 people inside the home and at the hospital, police said.