It happened around 10:10 a.m. Tuesday at the campus on Chambers Street.
Police say security guard Tyrone McNeese, 42, suffered a stab wound to his left forearm.
It began when two 15-year old girls were involved in a fight and, while that was happening, another fight began between another 15-year-old girl and a 16-year-old girl.
Several security guards interrupted the fights and held the girls against the lockers, police say.
That was when the 16-year-old allegedly pulled a knife from her bra.
Police say when the other girls saw the knife they broke free and ran away, with the 16-year-old in pursuit.
McNeese was running toward the area, police say, on his way to help his colleagues. He collided with one of the 15-year-old girls and both fell to the floor. The 16-year-old then arrived, and police say she tried to stab the girl who slammed into McNeese. Instead, police say the 16-year-old stabbed McNeese in the arm.
That's when the other security officers arrived and again tried to detain the girls. Police say one of the 15-year-olds tried to arm herself with a pair of scissors, but the guards were able to subdue her.
McNeese was treated and released from the hospital for his injury.
The 16-year-old girl was charged with aggravated assault, possession of a weapon for unlawful purpose and unlawful possession of a weapon (knife).
The15-year-old girl who tried to arm herself with scissors was also charged with aggravated assault, possession of a weapon for unlawful purpose and unlawful possession of a weapon (scissors).
Another 15-year-old girl was charged with disorderly conduct/fighting.
During the incident the school was locked down in order to contain the scene and to control the situation. No other students or faculty were injured during the incident.
Police say a search of the lockers of the girls was conducted, which resulted in the seizure of additional weapons.
