CHELSEA, Mass. (WWLP) - A 16-year-old girl is recovering after being attacked inside a high school classroom in Chelsea. Man accused of killing Springfield mother, baby in Hartford due in court The incident took place on Tuesday morning when the attacker walked into a Portuguese class with two friends and attacked another student, NBC Boston states. The teacher told them to leave and went to call the police. The teenager went to urgent care and was diagnosed with a concussion. She also had a bloody lip and an X-ray was taken of her bruised hand. The school district says they are actively investigating the incident. Local News Headlines Massachusetts sees largest population increase in 60 years College student dies in skiing accident at Massachusetts ski resort, Jiminy Peak 22News Hiring: Meteorologist Trump again knocks wind energy, subsidies WWLP-22News, an NBC affiliate, began broadcasting in March 1953 to provide local news, network, syndicated, and local programming to western Massachusetts. Watch the 22News Digital Edition weekdays at 4 p.m. on WWLP.com.