ENGLEWOOD CLIFFS - Authorities in Bergen County are trying to figure out from where a large oil sheen on the Hudson River originated.

Palisades Parkway police received several calls Friday afternoon reporting a strong odor of fuel coming from the shoreline of the Hudson River in Englewood Cliffs.

The department’s Marine Operations Bureau found a mile-long oil “sheen” in the river. They believe that it is from an unknown type of petroleum-based product. The lower portion of the Palisades Interstate Park in Englewood Cliffs was closed due to the strong smell in the area.

The United States Coast Guard and New Jersey Department of Environmental Protection came to the area and are investigating from where the oil may have come.

Police say the oil dissipation was rapid enough that mitigation will not be necessary. Authorities consider the spill to be minor in nature.

The environmental impact on the Palisades Interstate Park shoreline is being monitored by officials.