Massachusetts student charged after allegedly knocking principal unconscious

A 16-year-old student was arraigned Thursday on assault and battery charges after allegedly knocking her school's principal unconscious and attacking another staff member, CBS Boston reports. The principal of the Boston school, Patricia Lampron, was hospitalized but later released. 

Investigators said the incident began after a Henderson Upper Campus staff member asked the student to leave the school area, according to CBS Boston. The student then allegedly grabbed Lampron's hair and repeatedly hit her in the face and head. Sources told CBS Boston the 61-year-old suffered broken ribs and a head injury.

Another staff member was struck as well, but it wasn't clear if they were injured.