Police in Rialto in southern California responded to a reports of shots being fired at a house party on Saturday night.
Officers had to control a large crowd of people in front of the residence after what one witness described as at least 20 gunshots.
Broken glass and shell casings could be seen in the road outside, along with a grey SUV that had been hit by several gunshots, shattering the rear window and the windscreen.
There were reports the driver had fled, uninjured, while other injured people had gone to hospital.
The witnesses seemed intoxicated however.
The cause of the shooting is unknown.
It is also unclear whether any victims or suspects have been identified.