ALTURAS, Calif.—A 15-year-old boy was taken into custody after investigators said they found evidence he was planning a shooting at his high school in Northern California.

Authorities were called to the teen's home on Sunday after he pulled a knife on his parents and was attempting to load a .30-caliber rifle, Alturas Police Chief Tim Barnes told the Record Searchlight of Redding (http://bit.ly/RJuJk9) on Thursday.

The teen was being held at a mental health facility. His name has not been released because he is a juvenile.

The teen made statements that indicated he planned a shooting Friday at Modoc High School, Barnes said. The teen had chatted online about school shootings and talked to neighbors who had firearms, Barnes said.

"We're pretty sure he was planning this," said Barnes, who declined to elaborate.

Calls to Barnes and the Modoc County District Attorney's office by The Associated Press on Friday were not immediately returned.

Meanwhile, a 14-year-old boy was arrested Thursday for investigation of bringing a gun to school after rumors began spreading on a social media network that someone planned a shooting at a Central California high school.

The ninth grader was taken into custody in a classroom at Central High School, the Fresno Bee (http://bit.ly/Yth3vy) reported.

Authorities said the teen had a .25-caliber handgun and was playing with more than 50 rounds of ammunition in his pockets.

Fresno County sheriff's investigators and the school district superintendent said rumors started circulating Wednesday that someone planned a shooting on the Fresno campus, although there was no evidence that the rumors constituted a real threat or that it was linked to the student.

Prosecutors said Friday that no charges have been filed, although sheriff's officials said the teen could face counts of possessing a firearm while on campus, carrying a firearm in a public place and being a minor in possession of a concealed weapon.

His name has not been released because of his age.

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Information from: Record Searchlight, http://redding.com