A teenager was killed and three others were wounded in a shooting Wednesday evening following a graduation ceremony at Fairfield High School in California.

Police responded around 7:15 p.m. to the school parking lot, where the shooting occurred. Authorities said the victims included an 11-year-old and two adults, ages 20 and 25.

“There was one additional victim, an 18-year-old, who did succumb to their injuries sustained during this incident,” Fairfield Police Officer Michelle Belyea said.

Belyea said the investigation is ongoing but added there was “no ongoing threat to the community at this time.” Police have not released information about a suspect.

Witnesses described chaos as gunfire erupted while people were taking photos. One nearby resident told CNN, “I looked over the fence and people were just screaming and running through the parking lot. It was horrific.”

The school district said it was supporting those affected and would provide more information as it becomes available.