It happened along 23rd Avenue and 130th Street around 4 p.m.
The victim told police she was walking on the street when an unidentified male approached her.
The suspect approached the girl from behind and touched her private areas over her clothing, police said.
The suspect fled on foot in an unknown direction.
Police said the man is described as in his 40s, last seen wearing a blue shirt, cargo shorts and sandals.
The search for the suspect and the investigation are ongoing.
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