Hazmat teams were called to the Passaic River this Monday afternoon.
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News Copter 7 was over the scene where the oil slick was spotted along a stretch of the river in Wayne.
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There's no word yet on where the substance came from.
According to Wayne Police, the oil appeared to be small in size and it was only detected on the water's surface.
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Crews are working to determine how far downstream the oil traveled.
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