A child's birthday party in Northern California turned into a very sad and scary event on Saturday. A person with a gun started shooting at the party. Four people died and ten other people were hurt.
The shooting happened in the evening at a party place in the city of Stockton. The police do not know who the shooter is or why they did it. They are looking for the person very hard.
A police spokesperson said they think the attack was not random. This means the shooter probably wanted to hurt specific people at the party. But the police have not said who the target was.
Both adults and children were shot. The news made people in Stockton very upset and sad. The city's mayor said that families should be together at parties, not in hospitals worrying about their loved ones.
The police are still working to find the shooter and understand why this terrible thing happened.