Four people were killed and 10 others were hospitalized following a shooting at a California banquet hall where a family was hosting a celebration Saturday night, authorities said.

Gunfire erupted shortly before 6 p.m. at the location on the 1900 block of Lucile Avenue in the city of Stockton, San Joaquin County Sheriff’s Office spokesperson Heather Brent said at the scene.

Brent characterized the event as a family celebration. Jason Lee, vice mayor of Stockton, said in a statement that the violence erupted at a children’s birthday party.

Brent said the victims included children and adults.

“It’s unfathomable that there were young children that were harmed,” she said.

The exact conditions, ages and genders of the victims were unavailable, and sheriff’s investigators were working on

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