In a crowded elementary school in the Kansas City suburb of Overland Park, a gunman killed three students and wounded four others, including two educators.
The gunman also took hostages and was killed in a shootout with police.
Officials said the gunman was a 29-year-old man who had recently graduated from high school.
His mother, Patricia Pendergraft, told the Kansas State Journal that her son had just been in the ninth grade.
The shooter had a lengthy criminal record and had been on probation since 2011, according to a Kansas Department of Corrections and Rehabilitation website.
He was a graduate of Overton Park High School, where he scored high on a state test.
The website listed his high school address as 1023 E. Park St., Overland.
The shooting took place at the school, located on a residential street, about 30 miles east of Wichita, according, CBS affiliate KCTV.
The news station reports that the shooter is believed to have killed himself in a classroom.
In May, two of the victims, one male and one female, were found dead in a home in Overland, about 20 miles northwest of Wichita.
Authorities said they were searching for another suspect.
A police spokesman told The Associated Press that they have not yet determined a motive for the shooting.