Members of the department's Marine Operations Bureau located the large "sheen" following complaints of a strong odor along the shoreline in Palisades Interstate Park, Police Chief Michael Coppola said.
"With river currents moving the product and several ships in the area, a source could not be identified, as the spill or leak had stopped prior to officers arriving," he said.
The lower park area was temporarily closed.
"The product dissipation was rapid enough where mitigation was not necessary," Coppola said. "The product spill is considered to be minor in nature and impact to the Palisades Interstate Park shoreline is being monitored."
Marine Operations members coordinated with the United States Coast Guard Sector New York and National Response Center, he said.
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