An 18-year-old student was killed and three other people wounded Thursday afternoon in a shooting in the parking lot of a McDonald's restaurant across the street from a high school, sheriff's officials said.

The shooting just before 3 p.m. in the crowded parking lot of the restaurant left King High School senior Delshon Walton dead.

Witnesses told reporters at the scene that someone fired shots from a white van outside the restaurant, culminating a feud between two rival gangs. The van then sped off.

Sheriff's spokeswoman Debbie Carter said she could not immediately confirm that account.

No one was in custody, and deputies were still looking for suspects, Carter said. The shooting occurred when the parking lot was full of King students who were just released from school.

Walton and two other victims were taken to St. Joseph's Hospital by ambulance, and the fourth was taken by private vehicle to University Community Hospital, Carter said.

Carter said she did not know the extent of the injuries to the other three. Their names have not been released.