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MIAMI (CBSMiami) – It shocked students of Miami Jackson Senior High to hear police and the U.S. Marshals arrested a fellow student on campus Wednesday.

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Here’s what Miami Police said went down in an arrest report they released Wednesday evening.

Jason Villatoro, 17, was reportedly a passenger in a black Infiniti on Sunday, November 1st, when he and the driver chased another teen on his bicycle and knocked him down.

The driver and defendant-passenger exited the vehicle holding guns – pointing them at the alleged victim yelling, “Don’t move”.

The victim ran and called 9-1-1, telling police the armed passenger was a student from his school and identified him in a picture.

That led police and the marshals to the school, pulling Villatoro from class.

While searching Villatoro, police said they found a loaded Smith and Wesson 9mm gun to which he later admitted buying on the street.

They believe the gun is connected to Sunday’s aggravated assault.

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Miami Dade School officials released a statement on the matter saying, “Miami-Dade Schools Police is assisting the Miami Police Department in an ongoing case that has resulted in the arrest of a juvenile in possession of a weapon. We continue to maintain a strict policy regarding weapons on campus.  Our schools continue to be the safest place for our students to learn and become productive members of society.”

Sources told CBS4 faculty, students and parents were not informed of the incident.

Once students found out, they were understandably unnerved.

“That’s kind of scary. This is a school. I am expecting for me to be safe, and security, they should know this stuff so it’s crazy,” said student David Rodriguez.

Some teachers too were surprised to learn that a student was packing semi-automatic heat on campus.

“That’s quite disturbing. We’ve never heard of anything like that before at this school so that’s pretty disturbing to hear,” said teacher Ruth Taylor.

She heard it from CBS4’s Gary Nelson as did another parent.

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“Very concerned, my child goes here,” said parent Barbara Gonzalez.