ANTIOCH — Order is gradually being restored at Deer Valley High School as police investigate a drive-by shooting this morning that wounded a student outside campus, authorities said.

Students were allowed to call their parents for pickups beginning at 10:40 a.m., and have been given the option of leaving or continuing the school day, said Deer Valley principal Scott Bergerhouse. Parents have been signing up for pickups in the west cafeteria. Sports practice will be held after school as usual. A Senior Day trip to Waterworld USA in Concord will go on as planned for students who still want to go.

"We'll have a regular day here at Deer Valley High School as best we can," Bergerhouse said.

The shooting was reported about 8:30 a.m. on a sidewalk at the eastern entrance of the campus, off Sagebrush Drive near Lone Tree Way. Officers arrived to find a teenage boy with multiple gunshot wounds, police said. The victim was airlifted to John Muir Medical Center in Walnut Creek.

Bergerhouse said the boy was wounded in the arm and chest, and that he was conscious and responsive when police arrived. He also said the boy was able to call his parents, and was conscious as he was flown to the hospital.

Police said the shooting was preceded by an argument between the group of males the victim was with and another group in a car, who fled. One student reported hearing three to four shots; another, Christian Miller, 15, said she also heard gunfire.

"I used to live in Oakland, so I know what it sounded like," Miller said.

A student described the shooter's vehicle as a black sedan with tinted windows playing loud music, occupied by a driver and passenger. It was last seen eastbound on Indian Hill Road. The school was put on lockdown shortly after the shooting.

Don Gill, interim superintendent of the Antioch Unified School District, said the victim was a student who was attacked by a non-student. An Antioch police car left the scene with its lights on carrying a teenage boy in the back seat, but police did not confirm whether an arrest was made.

Gill said the entire school district has since been locked down as a precaution.

"We don't know if it was gang-related or if any retaliation is planned," Gill said.

In response to the lockdown, neighboring school districts are on alert. Pittsburg's school district plans to increase police presence at its two junior high schools, Pittsburg High School and Marina Vista Elementary because of its downtown location.

Check back later for online updates to this story.