Authorities in the San Francisco Bay Area are calling a shooting that left five dead during a Halloween party at an Airbnb rental a 'bloodbath,' where several partygoers were armed and some showed up looking for trouble.

Contra Costa Sheriff David Livingston said Friday that he knows residents in the plush San Francisco suburb of Orinda are on edge after the massive party on October 31 and wanted to provide an update, although he could not yet say what sparked the shooting and who shot whom.

Livingston said there is a wealth of evidence to process, including casings that littered the floors and countertops of the four-bedroom home that hosted roughly 100 people that night.

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

Five people were arrested in connection to the deadly shootings at a Halloween party in an Airbnb house. Jaquez Deshawne Sweeney, 20, (left) was held without bail on charges of suspicion of murder and conspiracy. Shamron Mitchell, 30, also faces a count of suspicion of murder and a count of conspiracy

The Costa Contra Sheriff's Office arrested five people in connection the deadly party house at an Airbnb Halloween night. The sheriff said rival gang were among the 100 people at the party. Those arrested include Jason Iles, 20, (left) and Lebraun Wallace, 28, both face charges of suspicion of murder and conspiracy. Devin Williamson, 21, (center) was charged as an accessory as is being held in lieu of making the $500,000 bail

Members of rival gangs from San Francisco and Marin City were among those at the party, he said, which was advertised on social media.

Livingston said that an altercation started in the kitchen of the house, and witnesses told investigators someone had tried to steal someone else´s property, which may have precipitated the shooting.

Livingston said there were 'multiple' shooters at the party.

He said investigators have reviewed video from that night and saw people tucking guns into their pants as they slipped past a front-door security guard who was drinking from a bottle of Hennessy.

He said some of the people went to the party 'with intent of causing harm and conflict.'

Five people were injured, which is one more than previously reported. Three had gunshot wounds but one had severe injuries from jumping more than 30 feet from a balcony to escape gunfire.

Tiyon Farley, 22, of Antioch; Omar Taylor, 24, of Pittsburg; Raymon Hill Jr., 23, of San Francisco and Oakland; Javlin County, 29, of Sausalito and Richmond; and Oshiana Tompkins, 19, of Vallejo and Hercules, died in the shooting.

The crime scene in the hours after a deadly Halloween shooting spree with five people dead in a rented Airbnb home. Five people are arrested in connection to the murders and the Contra Costa Sheriff said they are looking for additional suspects

Michael Wang, 58, who owns the mansion in the affluent San Francisco suburb of Orinda, had rented it out on Airbnb for the Halloween party. After receiving complaints about noise, he turned on his home security system (above) and saw dozens of people before the mass shooting

Contra Costa Sheriff David Livingston said the deadly Halloween shooting at an Airbnb party house with rival gangs in attendance was the worst crime scene he'd seen in his 32 years on the force

Livingston said while they arrested five people, authorities are looking for others. He said the party was filled with people carrying firearms, including two of the deceased.

Authorities arrested four people on Thursday on suspicion of murder and conspiracy. They are Lebraun Tyree Wallace, 28, of San Mateo; Shamron Joshua Mitchell, 30, of Antioch; and Jaquez Deshawn Sweeney and Jason D. Iles, both 20 and of Marin City. All four were being held without bail.

Party promoter Devin Isiah Williamson, 21, of Vallejo, was arrested as an accessory and was being held in lieu of $500,000 bail.

Airbnb's CEO Brian Chesky has since said that the San Francisco-based company was taking steps to stop unauthorized parties in the wake of the deadly shooting.