SANDY HOOK - The substance that spilled into Sandy Hook Bay has been identified as diesel fuel, according to the National Oceanic and Atmospheric Administration (NOAA).
A Coast Guard crew located a 2-mile-long, 300-foot-wide light sheen on the water on Thursday afternoon.
NOAA Emergency Response Coordinator Frank Csulak told News 12 New Jersey the fuel will likely evaporate throughout the day.
A boom was deployed to shield Horse Shoe Cove.
The shellfish beds have been closed as a precaution to protect wildlife that inhabit the bay.
Authorities are working to determine how the fuel got into the bay.