Officials in Tehama County say they're investigating at least seven crime scenes, one of which is an elementary school.
Johnston, of the Tehama County Sheriff's Office, told reporters that three weapons - a semi-automatic rifle and 2 handguns - had been recovered from the scene. The kids who were at the school are in a safe location, Johnston said.
"We made it aware that this guy is insane and he's been threatening us".
"I know that we have airlifted a number of students", an official said, referring to "airlifting" a number of victims to the hospitals.
Two children were among the wounded, it was confirmed.
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It said initial reports indicated the shooter had barricaded himself inside a building before being shot by police.
The school district was cooperating with local law enforcement, according to its statement. Mercy Medical Center in Redding received three patients, including one who also was transferred elsewhere, said Harter, whose company, Dignity Health, runs both hospitals.
Tehama County Superintendent of Schools Rich DuVarney there were no student or staff fatalities. Johnston said the school had been cleared by 10 a.m. but he did not have any information about the victims there.
The shooting reportedly started at a home and moved to the school, authorities said.
The roommates lived close to the gunman, and he said that the gunman was firing off rounds. He declined to release the name of the shooter but said the gunfire began with a domestic violence incident that neighbors reported.
The Sheriff has enacted the officer involved shooting protocol, and multiple agencies are involved.