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PHILADELPHIA (CBS) — A student was assaulted and badly beaten by around two dozen teens while he was walking home from school in the Kensington section of Philadelphia, police say.

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Police say 15-year-old George Gonzalez was walking home around 12:45 p.m. on Monday when he was assaulted by 20 to 30 juveniles on the 1800 block of East Lippincott Street. Surveillance video captured the school-aged children following Gonzalez.

When officers arrived on the scene, they found the boy injured and sitting on the sidewalk.

The teen was transported to St. Christopher’s Hospital with several bruises on his body, including his face.

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George’s mother says he was knocked unconscious but he’s OK now. they want to transfer schools because they are afraid for George’s safety.

“You don’t want to see your son like that. Thank God that he’s alive. They need to stop this violence,” said Wanda Lopez.

“This type of fighting and violence is not acceptable and we have been working to identify students who were involved, and there are others who may not be students in our schools who were involved, but we’re cooperating with the police department as we get to the bottom of that,” said Philadelphia School District spokesperson Lee Whack.

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An investigation into the incident is ongoing with the East Detective Division.