WYNCOTE, Pa. — Three teenage girls have pleaded guilty to assault after a brawl at a Pennsylvania school injured seven staff members, including a teacher who suffered a concussion trying to break up the fight.

The Philadelphia Inquirer reports (http://bit.ly/2qHZsER ) the girls, ages 15 and 16, will be sentenced June 1. Another 18-year-old student is also charged in connection with the fight.

Prosecutors say the brawl at Cheltenham High School, near Philadelphia, continued even as a teacher lay unconscious on the ground.

Lawyers for the teens say they had never been in trouble at school or with the law before.

Information from: The Philadelphia Inquirer, http://www.inquirer.com

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