At least three people have been killed and two children wounded in a shooting in a small northern California community, according to a Tehama County sheriff's deputy at the scene.
Tehama County Assistant Sheriff Phil Johnston said officers were investigating at least five crime scenes in the area.
He declined to release the name of the shooter but said he was "aware" of a domestic violence incident that neighbors reported.
Some students were transported to hospitals by helicopter, and others were moved to safe locations, the assistant sheriff's said.
The gunfire began at about 8am in the community of Rancho Tehama Reserve, about 130 miles north of Sacramento.
The Sherrif's office said that the shooting happened at around 8:00 AM local time with reports of somebody barricaded in a structure and of multiple victims.
"He said he saw bullets hit the truck in front of him, so he made his children get down and put his truck in reverse".
Brian Flint told local media his neighbor was the shooter, and that the neighbor had stolen his truck. "I know that the school's been cleared".
She said one patient was flown by helicopter to a hospital in Chico, about 80km south-east of the shootings.
A semi-automatic rifle and two handguns believed to be used by the gunman, who engaged police in a shootout, have been recovered, according to Johnston.
Wounded students were medevaced to nearby hospitals. Flint says he had been shooting "hundreds of rounds" from large magazines. "We made it aware that this guy is insane and he's been threatening us".
"Anne and I are saddened to hear about today's violence in Tehama County, which shockingly involved schoolchildren", Gov.