A student brought two pistols and ammunition to Thurgood Marshall Middle School in Scripps Ranch last week. As a result, seven students were arrested.
A fellow student reported seeing the weapons to an adult on Thursday, March 18, according to the school's principal Michelle Irwin.
Once school police investigated, it was discovered that seven students were involved.
Irwin sent a phone message and an email to parents Monday applauding the student who alerted the staff.
"I¹m pleased with how this situation was handled. I¹m proud of our students who did the right thing by sharing this information with administrators," she said.
Two of the seven arrested were taken to juvenile hall and later released. The others were released to their parents.
Under the district's zero tolerance policy, six have been suspended and may be expelled.
The seventh was suspended for five days after Thursday's incident.
Each could face criminal charges. Their cases have been referred to the San Diego County District Attorney's Office for review, according to a district news release.