A Frederick County sheriff's deputy used an electric stun gun to subdue a 17-year-old boy after he knocked a girl unconscious and assaulted a deputy outside Frederick High School, authorities said.
Several deputies were already at the school after classes ended Friday afternoon due to a number of student fights, Sgt. Mark Landahl said in a statement.
The boy was outside the school when he hit the girl in the head with his fist, knocking her out, Landahl said. The boy allegedly resisted arrest, assaulted a deputy and tried to run, Landahl said.
A deputy then fired a stun gun at the boy.
The girl was taken by ambulance to a trauma-center hospital in Hagerstown.