At least three people were killed and nine others injured in a shooting at a Halloween party in southern Los Angeles late Tuesday, authorities and local media reports said.
Aerial footage from local TV news channels showed paramedics treating the injured in a yard between a nail salon and a residential home in Long Beach.
Neighbours said the shooting took place at a Halloween party, according to broadcaster CBS.
The wounded were transported to local hospitals, the Long Beach Fire Department said on Twitter.
The Long Beach Fire Department said officials were called to the home at around 10:44 p.m. and came across what authorities described as a mass casualty incident.
Long Beach fire spokesman Jake Heflin said firefighters arrived at the home to “a scene obviously filled with chaos. There were 12 patients involved in this incident.”
The department said three men were dead and nine others were hurt, though their conditions were not immediately available. Most of the dead and injured were in their mid- 20s, police and fire officials said.
Officers found victims inside and outside of the home, said Long Beach police spokeswoman Jennifer De Prez. It is unknown if the gunman or gunmen fled on foot or in a vehicle, De Prez said.
It is also unclear how many people were in the home at the time of the shooting. De Prez said some victims may have driven themselves to area hospitals.