18-year-old killed, 3 wounded in high school graduation shooting

A teenager was killed and three people were wounded, including an 11-year-old, when gunfire erupted outside a high school graduation ceremony in Northern California, according to police.

The shooting took place at about 7:15 p.m. local time Wednesday in the parking lot of Fairfield High School after a ceremony ended there for Sem Yeto High School graduates, the Fairfield Police Department said.

Four victims were shot, police said. An 18-year-old died while an 11-year-old, a 20-year-old and a 25-year-old were injured, police said.

About 1,000 people were at the graduation "with hundreds of potential witnesses to this tragedy," police said in a statement on Thursday.

"Detectives are currently identifying and interviewing these witnesses and are actively following up on investigative leads," police said.

The Fairfield-Suisun Unified School District said in a statement, "Our thoughts are with the individuals affected."