Four people were killed and more were injured in a Halloween night shooting at a house part in Northern California, according to officials.

Police responded to the home in Orinda, outside of Berkeley, at about 10:50 p.m. local time Thursday, according to police. More than 100 people were at the party.

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Three people died at the scene, and another was pronounced dead at the hospital, said a Friday statement from the Contra Costa County Sheriff’s Office. More people were taken to hospitals, but police don’t know how many since some could have brought themselves to the hospital.

David Cook, the Orinda Police Department chief, said at least four people were injured.

An initial person who called police said she heard gunshots, but thought the sound could also be firecrackers, according to a recording of a dispatcher report. She said dozens of people were running outside the house. A second person who called said they saw a person with a gun.