One student brought a gun to Central High School Thursday.
A Buchanan student was arrested after police found him in possession of chemicals.
And a 14-year-old was arrested for making threats against Mount Whitney students.
Thursday, Fresno Sheriff's deputies arrested a 9th grader at Central High School's west campus, for bringing a gun to school.
He is now at Fresno's Juvenile Justice Center.
Clovis police found chemicals and other materials while disciplining a truant Buchanan High School student.
Police say it was not a bomb, but that the items are related to another threat from August.
Then, early Friday morning, Visalia police arrested a 14-year-old after learning of his plot to open fire at Mount Whitney High School.
Visalia Police Capt. Jason Salazar says it was part of a gang initiation.
"It involves rival gangs. There was a rival gang member at that school who had made some comments about the gang he was associating himself to."
Investigators have been working closely with school officials to make sure the suspect was acting alone.
"We meet with them frequently to discuss our emergency procedures and so I think that's why this has gone so smoothly."
Police aren't saying where the suspect goes to school, only that he lives in Woodlake.
Investigators found no weapons, and say the suspect did not have the means to carry out his threat.
The incident left parents like Tonya Ibarra concerned heading into the holiday break.
"It's scary because of the stuff that's been going on lately, you know, with all the other shootings at the schools and stuff. "
School officials praised the immediate actions of law enforcement to protect students and employees.
Clovis Unified says having multiple eyes and ears is critical for the protection of students, staff, and the community.
Because of the Mount Whitney incident, Visalia police say extra security was in place at area schools today.
Central, Clovis, and Visalia Unified School Districts are now on their holiday breaks.