(CNN) A father has filed a federal lawsuit after a newly-released surveillance video shows Chicago police officers dragging his daughter down the stairs and punching her multiple times at a city high school.
The incident happened on January 29 at the Marshall High School on the city's West Side, the lawsuit states, after the 16-year-old girl was asked to leave school because she had her cell phone out in class.
Her father had been asked to come to the school to pick her up and witnessed part of the incident, according to the lawsuit.
The video shows the student standing next to an officer before she turns to walk away.
As she does so, one officer grabs her and moves her toward the stairs.
The lawsuit says the girl grabbed the officer's vest to avoid falling down the stairs, but as a result they both fell. »
