The incident happened just after ten o'clock Friday night at the McDonald's on Ridge-McIntire Road in Downtown Charlottesville.
Charlottesville Police tell us a group of about 20 teenagers were fighting in the restaurant's parking lot. At least one shot was fired. No one was hurt.
When police responded, the suspect who fired the shot was arrested.
They're still searching for another suspect believed to have fired at least one other shot.
The also detained another person nearby on the grounds of the county office building.