Four people were killed and at least four injured at a Halloween party shooting at a Northern California home rented by a woman who falsely claimed she wanted the Airbnb so her asthmatic family members could escape wildfire smoke, police and a person with knowledge of the transaction said Friday.

Gunshots were reported at about 10:45 p.m. Thursday at the large home in the wealthy San Francisco suburb of Orinda where more than 100 people had gathered, police said. The home, surrounded by trees and up a steep driveway, had been rented on Airbnb by a woman who told the owner her dozen family members needed a location with fresh air, the person with knowledge of the transaction told The Associated Press.

Three people, all from the Bay Area, died at the scene and a fourth died at the hospital, authorities said. The Contra Costa County Sheriff's Office identified them Friday evening as 22-year-old Tiyon Farley of Antioch, 24-year-old Omar Taylor of Pittsburg, 23-year-old Ramon Hill Jr. and 29-year-old Javin County.

Other people were wounded by gunshots or injured in the panic that followed, authorities said.

A one-night rental on Halloween was suspicious enough that before agreeing to rent the home the owner reminded the renter that no parties were allowed, said the person, who was not authorized to publicly disclose the information and spoke only on condition of anonymity.

The renter, whose name and hometown have not been disclosed, told the homeowner that her family members had asthma and needed a place to escape the smoky air. A giant wildfire burning in Sonoma County about 60 miles (97 kilometers) north of Orinda earlier in the week forced tens of thousands to evacuate and fouled the air over a wide area.

Michael Wang, who owns the 4,000-square-foot (372-square-meter), four-bedroom house, said his wife reached out to the renter Thursday night after neighbors contacted them about the party. The renter said there were only a dozen people at the home. However, Wang said he could see more people on video from his doorbell camera.

"We called the police. They were on the way to go there to stop them, but before we got there the neighbor already sent us a message saying there was a shooting," he told the San Francisco Chronicle in a phone interview. "When we arrived there, the police were already there."

Two guns were found at the scene.

Though no suspect was identified or arrested, Orinda Police Chief David Cook said at a news conference there is no ongoing threat to the public.

"We don't have any reason to believe that they stayed in the area," Cook said. "We don't have any reason to believe that they were from Orinda." 

Cook did not address a possible motive or whether more than one person was involved in the shooting that made people run out of the house in terror.

The party apparently was advertised on social media and one attendee said he was inside the main floor, enjoying the music and watching people dance, when he heard shots and people started running. The screaming seemed to last forever, said Devan, who asked that his last name not be used because he feared for his safety.

"Everybody started running, scrambling," he said. "People were just collapsing and friends were helping friends. It was a scary situation and then as everyone is panicking and stuff, there were more shots."