STOCKTON, California: Authorities in California appealed to the public for tips, cellphone video, witness accounts and even rumors as they searched Sunday for a suspect in the killing of three children and an adult during a mass shooting at a child’s birthday party.

Someone opened fire at a banquet hall in Stockton where 100 people or more had gathered on Saturday, San Joaquin County Sheriff Patrick Withrow told reporters. He said detectives believe the gunfire continued outside and there may have been multiple shooters.

Withrow said the deceased were ages 8, 9, 14 and 21. Eleven people were also wounded, with at least one in critical condition, he said. No one was in custody by Sunday evening, and the sheriff urged anyone with information to contact his office.

“This is a time for our community to show that we will not put up with this type of behavior, when people will just walk in and kill children,” Withrow said during a Sunday media briefing. “And so if you know anything about this, you have to come forward and tell us what you know. If not, you just become complacent and think this is acceptable behavior.”

Sheriff’s spokesperson Heather Brent said earlier that investigators believe it was a “targeted incident.” Officials did not elaborate on why authorities believe it was intentional or who might have been targeted.