A middle school teacher was viciously attacked and knocked unconscious inside the school.

Police say that Annika McKenzie, 34, attempted to strangle her child's math teacher, Catherine Engelhardt, at Alverta B. Gray Schultz Middle School in Hempstead, NY on Wednesday. 

McKenzie allegedly put Engelhardt into a head lock and then threw her on the ground. 

Several students, including McKenzie's 14-year-old niece, reportedly began kicking and punching her. 

WNYW reported that McKenzie's attorney claims the teacher triggered the altercation by putting her hands on her daughter.

Police have charged both McKenzie and her niece with assault. McKenzie also faces strangulation charges, WNYW reported.

The school district says the incident is under investigation. The school's surveillance system allegedly recorded the violent attack, showing Engelhardt laying unconscious at one point.

Engelhardt has been released from the hospital and is recovering at home. 

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