A gunman opened fire and killed at least three people and wounded four more in Gable House Bowl bowling alley in Torrance, 32 kilometres (20 miles) south of Los Angeles, California on early Saturday.
A victim was seen receiving first aid inside the premises following the shooting.
Investigations were ongoing as police and inspectors of Crime Scene Investigation (CSI) searched the building for... Еще evidence.
The shooting reportedly took place after an argument broke out during a birthday party at the bowling alley.
Police have urged people to keep away from the area around the building.