In Ruskin, Florida, a 17-year old brought a gun to high school in his car.  When his friend, a former student, found the gun, he accidentally shot himself, but was then able to drive himself to the hospital. The 17-year old was arrested and charged with possession of a gun on school property. 

The school was placed on lockdown after the incident.

Source:

Emily McCain, “Accidental Shooting in Lennard High School Parking Lot Leads to Lockdown, Student Arrest,”  Action News WFTS (August 18, 2022).