Stabbing after high-school graduation in Daly City under investigation
15-year-old boy arrested for stabbing at Daly City graduation ceremony
Daly City Police said officers responded to a fight involving multiple people at a high school graduation ceremony around 4:30 p.m Friday. Officers found a 21-year-old with non-life-threatening stab wounds, and a 15-year-old boy was arrested in connection with the stabbing.
DALY CITY, Calif. - Officials say a non-fatal stabbing happened following a Daly City high school graduation ceremony on Friday. A teenager has been arrested for assault with a deadly weapon, police say.
Campus stabbing
What we know:
The Daly City Police Department said officers responded to the high school graduation ceremony at 4:30 p.m. on the report of an active fight involving multiple subjects.
When officers arrived, they located a 21-year-old victim who was suffering from non-life-threatening stab wounds. The victim was transported to a local hospital to be treated.
A 15-year-old boy was identified as the stabbing suspect and was arrested.
Police said no other reported injuries as a result of the fight. The weapon used in the stabbing was recovered from the scene by police. Police did not describe that weapon in detail.
Screen grab of video of a fight and stabbing on campus during a graduation ceremony at Westmoor High School in Daly City. May 22, 2026.
Principal's statement
Victor Zou, principal at Westmoor High School, issued a statement this evening that said police and emergency personnel responded immediately and remained on site.
He did not indicate the severity of the victim's injuries nor did he say if the perpetrator was a student.
It is also not clear what the adult victim's relationship to the high school is.
The school is located at 131 Westmoor Avenue.
"At this time, we are cooperating fully with law enforcement. We understand this news is deeply upsetting for our students, families, staff, and community. Our thoughts are with all those impacted by this incident," Zou's statement read.
Videos of violence
KTVU has received videos of violence on campus from separate sources. The chaotic moments of a fight breaking out on an outdoor basketball court are captured. One video shows a person on the ground being attacked by a group and someone coming to their defense. The person who came to the defense is also attacked.
Later in the video, two people who are fighting are pulled apart. One of them appears to be bleeding profusely from their face and torso. By the end of this video, police arrive on the scene and chase people involved in the fight on foot.
Someone can be seen trying to intervene to break up the fight. There are plenty of bystanders, some are wearing their caps and gowns.
Other videos show different angles. One person in the background can be heard saying, "get these punks out of our school." Others can be heard calling for some type of security intervention.
What you can do:
Police are asking anyone with more information about this investigation to contact them at 650-991-8169.
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