By Annie Sciacca/Bay Area News Group
At least three of the five suspects arrested in connection with a Halloween night party shooting inside an Orinda mansion that left a handful of people dead had criminal records and some of them — as well as two of the slaying victims — may have belonged to gangs, Contra Costa County Sheriff David Livingston revealed Friday during a news conference.

“It was a bloodbath,” Livingston said. In his 32 years in law enforcement, “I’ve never seen a homicide scene like this, personally,” he added.
Livingston said there were “multiple” shooters that night and that authorities were seeking other people involved. In addition to those killed at the party, which was attended by more than 100 people, three suffered gunshot wounds and others were injured after jumping 30 feet from the balcony to escape the chaotic scene.
The shooting suspects have been identified as Lebraun Tyree Wallace, 28, of San Mateo; Jaquez Deshawn Sweeney, 20, of Marin City; Jason D. Iles, 20, of Marin City; Shamron Joshua Mitchell, 30, of Antioch; and Devin Isiah Williamson, 20, of Vallejo.
The sheriff said Williamson, identified as the party’s promoter, was booked on suspicion of conspiracy and as an accessory. The others were booked on suspicion of murder and conspiracy. Livingston said there is reason to believe Williamson and the others intended to cause harm when they arrived at the party.
Two of the slaying victims — Raymon Hill and Javlin County — also were armed and were associated with gangs in San Francisco and Marin City, Livingston said. He said Hill was associated with the Page Street Mob in San Francisco and County was associated with the Marin City Jungle. Livingston said investigators don’t know whether the shooting was gang-related. The other victims have been identified as Tiyon Farley, 22, of Antioch; Omar Taylor, 24, of Pittsburg; and Oshiana Tompkins, 19, of Vallejo and Hercules.
Police recovered four guns connected with the crime and expect to find more, Livingston said, adding that there were “many” of them at the party. He said it’s believed the shooting started in the kitchen after a fight broke out over someone’s attempt to steal property. He did not elaborate on any specific motives.
“This investigation is still in its early stages,” Livingston said. “We do have people in custody, but there are others we are seeking now.”
The shooting occurred around 10:50 p.m. on Oct. 31 at 114 Lucille Way in Orinda, according to the Sheriff’s Office, in the house that had been rented through Airbnb. In calls to police, partygoers described multiple people lying in pools of blood inside the house and people jumping off balconies and hiding in closets to escape the gunfire, according to police logs.