Authorities in California said Wednesday that the body of the wife of a man who went on a shooting rampage Tuesday was found in the floorboards of their home, bringing the death toll to six.

The series of shootings in northern California also left two schoolchildren wounded by gunfire.

Police shot the gunman, the Los Angeles Times reported, who was among the six people who died Tuesday afternoon. Authorities did not name the gunman.

The shootings took place at around 8 a.m. in multiple locations in Rancho Tehama Reserve, near Red Bluff, California, roughly 130 miles north of Sacramento, according to the Associated Press in an earlier report.

In an interview with local television station KCRA, Tehama County Assistant Sheriff Phil Johnston said a number of students were air lifted to the hospital for further treatment.

“Right now we do not have an active — or an accurate — count of all those who have been injured in this incident,” he said at a news conference with reporters later in the day.

Johnston said at the conference that police had received “911 calls of multiple different shooting sights including the elementary school.” It was clear “we had a subject that was randomly picking targets.”

He added that there was a domestic violence incident as reported by neighbors involving the suspected shooter.

Johnston said Wednesday that investigators believe the fatal shooting of the man’s wife was what triggered his killing spree.

More than 100 law enforcement officials in Rancho Tehama Reserve are working across multiple crime scenes, Johnston said.

California Gov. Jerry Brown said in a statement that he was saddened by the violence in Tehama County, which “shockingly involved schoolchildren,” and offered condolences to all those affected by the shooting.

PBS NewsHour’s Courtney Norris reported for this story.