Attack occurred Wednesday at Alverta B . Gray Schultz Middle School in Hempstead , New York . Mother McKenzieAnnika McKenzie , 34 , breached security by getting into building . Believed math teacher Catherine Engelhardt had touched her daughter , 12 . Annika McKenzie allegedly attacked her , with students joining . One of them was allegedly Annika McKenzie 's 14-year-old niece . Annika McKenzie 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 .