At least two children are among the wounded - a student at Rancho Tehama Elementary School in Tehama County was shot, and another child was shot in a truck along the road, according to Assistant Sheriff Phil Johnston. "I know that the school's been cleared".
Sheriff Johnston said that a number of students have been airlifted out and that the uninjured students are now safe.
There were at least 100 law enforcement officers at the scene, with "multiple scenes".
On the way, he said, he saw an apparent gunshot victim and police at another scene.
At least one student was wounded at the school.
Police from Red Bluff, investigators from the Department of Justice, Federal Bureau of Investigation and Tehama County District Attorney's Office, and California Highway Patrol officers are assisting across the "widespread scene", Johnston said. The first calls described a shooting on Bobcat Lane; calls from multiple other sites soon came in, including the elementary school. Brian Flint tells the Record Searchlight newspaper in the city of Redding on Tuesday that his neighbor, whom he knows only as Kevin, also stole his truck.
Authorities in California say three people have been killed and multiple children have been injured in a number of shootings in California.
A second child also was reported to have been shot in the right leg, according to emergency dispatch reports. Flint says he had been shooting "hundreds of rounds" from large magazines.
Gov. Jerry brown issued a statement on the shooting, saying: "Anne and I are saddened to hear about today's violence in Tehama County, which shockingly involved schoolchildren".