PHILADELPHIA (CBS) — Philadelphia Police are investigating another sexual assault involving a man on a bicycle.

It happened Saturday night around 11.

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Police say a woman was walking along the 1600 block of Bainbridge Street, a few blocks away from South Broad Street, when a man rode by on a bicycle and groped her.

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Police have not determined if it is related to several other recent incidents.

Last week, investigators released surveillance video of a man on a bike riding up to a woman, touching her and riding off.

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The incidents happened in the East Passyunk and Washington Square West neighborhoods.