Deputies were called Friday to East Los Angeles, where a young student was fatally stabbed at David Wark Griffith Junior High School.
A boy was reportedly stabbed Wednesday by a group of juveniles in Long Beach.
Grief counselors were on the campus of an Orange County junior high school Tuesday following the death of a 12-year-old student.
Police have made an arrest in the stabbing death of a 12-year-old boy in Anaheim Monday.
Investigators say a 12-year-old boy has stabbed another middle school youth in a fight over a girl.