The American media reported on Saturday evening (local time) that a shooting took place in the city of "Sacramento" in the state of California.
The Sacramento sheriff said two people were killed and five others were injured in a shooting at a large Halloween party near Foot Hill.
According to US media reports, the city police said in a statement that police officers were sent to inspect the area where hundreds of people had gathered for the Halloween party.
A Sacramento Police Department spokesman confirmed that the shooting took place in a party hall.
According to American media, police officers found three men who had been shot. Two were pronounced dead at the scene and a third was taken to hospital with serious injuries but in stable condition.
Sacramento police say no information is available on the suspects and the assailant or assailants have not yet been arrested.