Attack occurred Wednesday at Alverta B . McKenzie in Hempstead , New York . Mother Annika Gray Schultz Middle School , 34 , breached security by getting into building . Believed math teacher Catherine Engelhardt had touched her daughter , 12 . Gray Schultz Middle School allegedly attacked her , with students joining . One of them was allegedly Gray Schultz Middle School 's 14-year-old niece . Gray Schultz Middle School and the niece were arrested at the scene and charged . Engelhardt was unconscious for several minutes and taken to hospital .
Attack occurred Wednesday at Alverta B . Gray Schultz Middle School in Hempstead , New York . Mother Annika McKenzie , 34 , breached security by getting into building . Believed math teacher Catherine Engelhardt had touched her daughter , 12 . McKenzie allegedly attacked her , with students joining . One of them was allegedly McKenzie 's 14-year-old niece . McKenzie and the niece were arrested at the scene and charged . Engelhardt was unconscious for several minutes and taken to hospital .