(CNN) Some of the suspects and victims in a deadly shooting at a Halloween party in Northern California have convictions and gang affiliations, authorities say.

Five people were arrested Thursday in connection with the shooting at an Airbnb rental in Orinda that killed five people and injured more.

Several shooters fired weapons at the party and officers recovered four firearms, Contra Costa County Sheriff David Livingston said during a press conference Friday.

"In my 32 years of law enforcement, I have never seen a homicide scene like this ever," Livingston said. "It was a bloodbath inside the home."

Rival gang members got into a fight inside the home, Livingston said, and someone tried to steal something from a person, which might have led to the first shootings.

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