NEW YORK (WABC) -- Subway riders who take the A train are trying to solve a disgusting mystery.
Someone has been putting peanut butter on the poles inside the train cars.
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Photos show the gross vandalism that has occurred at least three times since last month on A trains from Harlem to Canal Street.
The MTA says it is looking into the incidents.
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Riders are wondering why someone would do such a thing.
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