A woman approached a Hasbrouck Heights police lieutenant on a traffic detail and said she'd seen what she thought was a suspicious incident near North Williams Avenue.
Someone apparently had tossed a shopping bag near the train tracks off the highway.
Social media being what it is, rumors grew of a possible body, so borough police summoned a Bergen County sheriff's K9. New Jersey Transit police also responded.
It turned out to be "one of those plastic shopping bags, like you get at KMart or one of those stores," a law enforcement official said.
There was nothing in it.
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