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UPDATE: Richmond Police Ask for Public's Help After Mass Shooting Leaves 3 Dead, 5 Wounded

RICHMOND (CBS SF) -- Richmond police on Monday asked for the public's help in their investigation of a mass shooting at a house party on Father's Day evening late Sunday that left three people dead and five wounded.

It was the second mass shooting in the San Francisco Bay Area in the last 48 hours. On Saturday, a 22-year-old San Francisco man died and seven others were wounded in a shooting at Oakland's Lake Merritt.

ALSO READ: San Francisco Gang Warfare Blamed For Oakland Lake Merritt Mass Shooting

On Sunday evening, gunfire erupted at a house party in the 2100 block of Dunn Avenue in Richmond just before 11 p.m. At the time a traditional Guatemalan marimba gathering with about 100 people in attendance was underway.

When officers arrived at the chaotic scene, they discovered eight victims suffering from gunshot wounds.

Of the five victims who survived the shooting, police said, one was in critical condition and another in fair condition. Three others were treated at local hospitals and released.

The California Highway Patrol said one of its helicopter crews airlifted a shooting victim to John Muir Medical Center in Walnut Creek where he was treated by the trauma team.

Two victims were declared dead at the scene while a third succumbed to their injuries at the hospital. A family member said in Spanish that his uncle was killed in the shooting. The names of the three victims killed were being withheld pending notification of the next to kin.

Richmond police Sgt. Aaron Pomeroy told reporters that more than one person walked up to the house and shot into the groups of families right in front of the house.

"The party was advertised on Facebook and that's how most of the partygoers found out and actually attended," said Richmond Police Lt. Matt Stonebraker. "So it doesn't appear this is a family event or even friends or anything like that. Most of them don't even know each other.

There were hundreds of beer bottles and cans scattered along the sidewalk.

"I would assume that alcohol did play a part. There is a lot of it on scene," said Stonebraker. "We don't really know at this time. It is still very early on in this investigation."

Richmond police said the shooting appears to have been targeted and isolated to the Sunday night gathering.

Authorities said there was no immediate information on suspects or the motive behind the shooting. Police are interviewing witnesses and victims and asking for the public's help if anyone has information regarding the deadly incident.

Police said that there were houses in the area that had surveillance cameras set up. Authorities are reviewing some of the footage captured by those cameras as they search for clues.

In Oakland, police said the Lake Merritt victims included four males ranging in age from 16 to 27 and a 21-year-old female -- all of whom were in stable condition. The sixth victim, another female, was also in stable condition.

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