POWAY (CBSLA.com) — A 12-year-old boy has been arrested and taken to a hospital for evaluation after allegedly threatening to shoot 23 students at a teacher at a San Diego-area middle school.

Crisis counselors have been deployed to Twin Peaks Middle School in Poway, where an administrator received an email that threatened to shoot people and claimed to have 3,000 rounds of ammunition, San Diego County Sheriff’s officials said.

“The threat indicated that on Monday, Feb. 11, 23 students and a Twin Peaks Middle School teacher would be shot,” sheriff’s Capt. Bill Donahue said at a news conference.

The boy, a 7th grade student at the school, was arrested Saturday night.

Weapons were among the items seized from the boy’s home.

“Several computers, along with numerous rifles and handguns, were seized from the residence,” Donahue said. “The student was taken into custody for making terrorist threats.”

The boy is at a hospital, under evaluation, sheriff’s officials said.