A report of a student with a firearm was made shortly before noon, and two school resource officers arrested the student after a brief foot chase, according to San Jose police.
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They found the student had a loaded ghost gun and confiscated the weapon.
"Thanks to the quick actions of these on-campus School Resource Officers, this gun was seized and possibly prevented a tragic event from occurring," police said in a Twitter post.
The incident is under investigation and there is no ongoing threat to the public or school, police said.