An argument between summer school students turns violent Tuesday afternoon.
Madison police say at about 12:30 p.m., several teenagers started arguing when they were leaving Memorial High School.
When the group got to the West Towne Mall parking lot, a fistfight broke out. One of the teens allegedly took out a concealed weapon, and used it to hit a 15-year-old victim in the mouth and head.
Paramedics treated the victim at the scene.
The 15-year-old suspect carrying the concealed weapon has been arrested. Authorities say there could be more arrests.