Vicious high school beating caught on tape

A disturbing classroom attack inside a high school classroom in Chicago was captured by a cell phone camera.

Two teenage sisters are seen attacking a fellow student during biology class last week as the rest of the class -- and the teacher - stand by, out of harm's way.

CBS News national correspondent Dean Reynolds reports the fight was apparently linked to some insult on a social networking site.

At one point on the tape, the two attackers appear to slam their victim's head on a lab table.

The attackers, 17 and 18 years old, have been charged with misdemeanor battery and suspended from school.

Their victim suffered bruises, but was not seriously injured.

In a statement, a spokesman said "The Chicago Public Schools do not tolerate violence among students in any way."

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