MIAMI (WSVN) - Three individuals were arrested after a violent fight led to a stabbing at Miami Northwestern Senior High School, according to an arrest report from the Miami-Dade Sheriff’s Office. That stabbing landed an 18-year-old student in the hospital.
According to an arrest report from MDSO, 15-year-old Carlos Martinez, who was seen being initially attacked by two students, had a knife with a five-inch blade.
The teen appeared in juvenile court on Tuesday, and prosecutors said they intend to charge him as an adult.
Cellphone video captured two people attacking Martinez by punching, kicking and at one point body slamming him.
Later in the video, students are seen running away through the hallway, but the chaos doesn’t end there. A student is heard saying that Martinez has a weapon.
“He’s got a knife, he got a knife,” said a student.
The arrest report states that “during the incident, Def-1 can be observed, reaching into his pants and retrieving a light-colored blade object. Def-1 then sprints down the hallway in efforts for retaliation on his attackers.”
Authorities said the 18-year-old victim was stabbed in the back while fleeing the chaos, and Martinez received cuts to his hand from a self-inflicted injury.
The 18-year-old victim told police that he was not a part of the fight, and was watching like everyone else.
The arrest report shared testimony from the 18-year-old, which reads: “Next thing I know, everyone starts running, so I start running too. I felt a push in my back, but I just thought one of the kids that were running pushed me. Another kid told me, ‘Yo, you’re bleeding.’ That’s when I felt something dripping down my back.”
7News cameras captured the 18-year-old victim being taken into Jackson Memorial Hospital Ryder Trauma Center. First responders said the 18-year-old suffered serious injuries but was stable.
Martinez was taken to the hospital and later taken into custody. The teen faces charges of aggravated battery with a deadly weapon and possession of a weapon on school property.
Tuesday morning, students at the school reacted to the violence on campus.
“It’s crazy, honestly,” said student Dagna Caceres. “Incidents like this have happened.”
Parents also expressed an increased need for security on campus, and hope to prevent weapons from being used at school.
Miami-Dade Public Schools officials released a statement that reads in part:
“The matter was immediately addressed by the school’s administration and the Miami-Dade Schools Police Department, subsequently resulting in criminal charges. The District takes the safety and well-being of our students and staff very seriously and remains committed to maintaining a secure school environment for all.”
The 18-year-old has since been released from JMH and is recovering at home. His mother said the family is considering additional legal action.
7News has reached out to Miami-Dade Schools Police about what charges the other two students who were arrested could be facing.
Copyright 2026 Sunbeam Television Corp. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.