The incident happened on May 21 just before 11 p.m.
The girl told police that she was approached by the suspect, who she did not know, as she rode on the S46 bus.
That's when the man allegedly placed his hand on her thigh and kissed her neck. The girl also said the suspect bit her hand.
Police say the man got off the bus at the Van Pelt and Walker Street stop and fled the scene.
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