Perry Hall High School was briefly placed on lockdown Thursday after police broke up a fight behind the school, Baltimore County police said.
Sgt. Gladys Brown, a spokeswoman for the department, said all students have been dismissed from the school safety. She said one person was taken to a hospital with non-life-threatening injuries.
The victim was a student, police said. Police said they made no arrests.
Perry Hall Principal Craig Reed told parents that the lockdown delayed student dismissal by about 10 minutes and all after-school activities were canceled.
"Due to police activity in the woods behind the school, we activated a Lockout Protocol at 1:55 p.m. out of an abundance of caution," Reed said. "Baltimore County police officers responded to investigate and gave us clearance to end the lockout at 2:40 p.m. "